The volume of the 0.7×10⁻³ M NaOH solution needed is 1.79 mL
Data obtained from the questionThe following data were obtained from the question:
Molarity of stock solution (M₁) = 0.7×10⁻³ MVolume of diluted solution (V₂) = 25 mL Molarity of diluted solution (M₂) = 0.5×10⁻⁴ M Volume of stock solution needed (V₁) = ? How to determine the volume of stock solution neededThe volume of the stock solution needed can be obtained as follow:
M₁V₁ = M₂V₂
0.7×10⁻³ × V₁ = 0.5×10⁻⁴ × 25
Divide both side by 0.7×10⁻³
V₁ = (0.5×10⁻⁴ × 25) / 0.7×10⁻³
V₁ = 1.79 mL
Thus, the volume of the stock solution needed is 1.79 mL
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What would be the final temperature if 3.31 x
18.5 grams of water at 22.0°C?
The final temperature of the water is 64.59°C.
Given,
Heat (Q) = 3.31 x 103 J
Mass of water (m) = 18.5 gm
Initial temperature (Ti) = 22°C
Final temperature =?
Specific heat - The heat required to raise the temperature of a substance by one-degree Celcius. The relation between heat and temperature change is Q = m × c × ΔT.
where Q = heat energy
m = mass of the substance
c = specific heat of the substance
ΔT = change in temperature
Now, we will use the same formula to calculate the final temperature of the water-
Q = m × c × ΔT
Q = m × c × ( final temperature - initial temperature)
3.31 x 103 = 18.5 x 4.2 x (final temperature - 22)
(Specific heat of water (c) = 4.2 J/g degrees Celcius)
3.31 x 103 = 77.70 x (final temperature - 22)
3.31 x 103 / 77.70 = final temperature - 22
33100/777 = final temperature - 22
42.59 = final temperature - 22
Final temperature= 42.59 + 22 = 64.59°C
Hence, the final temperature of the water is 64.59°C.
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If you have a sample of naphthalene than is contaminated with sodium sulfate (na2so4), what would be the best way to remove this impurity?
Dissolve the naphthalene in minimum amount of hot methanol and hot filter the suspension. Impure samples of naphthalene can be purified by sublimation.
Certain organic substances change directly from the solid to the gaseous state when heated, without going through the liquid state. This process is called sublimation. In this process, the naphthalene generated becomes smoke and impurities remain. Steam can be cooled by condensation. This method is very useful for separating volatile solids from non-volatile solids.
Impure sublimable organic compounds are placed in a porcelain dish and covered with perforated filter paper. Place a cotton-plugged funnel on top of the filter paper to prevent organic compound vapors from escaping. A porcelain bowl is gently heated.
Organic compounds sublimate and vapor rises through the holes in the filter paper into the funnel. Because the funnel is cooler than the bowl, vapors condense on the cool walls of the funnel to form pure crystals of organic compounds.
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if you were to become a scientist what will be your contribution to the society? why?
Answer:
Reducing Plastic Waste and Pollution
Explanation:
If I were a scientist I would begin working on reducing the number of plastics that are left in landfills and other wastelands. The first solution that comes to mind is cloning a type of melee worm that feeds off of plastic and styrofoam rather than rotting foods and compost. This would be an extremely positive contribution to society because it would keep the earth from being filled with garbage.
The above shows an immovable chamber at 298 K with a pressure of 450 kPa. If the temperature rises to 377 K, what is the new pressure of the chamber? kPa Round your answer to 3 significant digits. Do not include units in your answer.
Taking into account the Gay-Lussac's law, the new pressure of the chamber is 569.295 kPa.
Gay-Lussac's lawGay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of shocks against the walls increases, that is, the pressure increases.
That is, the gas pressure is directly proportional to its temperature: when there is a constant volume, as the temperature increases, the gas pressure increases, and when the temperature decreases, gas pressure decreases.
Gay-Lussac's law can be expressed mathematically as follows:
P÷T= k
Considering an initial state 1 and a final state 2, it is fulfilled:
P₁÷T₁= P₂÷T₂
New pressureIn this case, you know:
P₁= 450 kPaT₁= 298 KP₂= ?T₂= 377 KReplacing in Gay-Lussac's law:
450 kPa÷ 298 K= P₂÷ 377 K
Solving:
(450 kPa÷ 298 K)× 377 K= P₂
569.295 kPa= P₂
Finally, 569.295 kPa will be the new pressure.
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what is the chemical formula for muscotive
The chemical formula of muscovite is given as (KF)₂(Al₂O₃)₂(SiO₂)(H₂O).
What is Muscovite?The mineral muscovite is very useful in the formation of rocks. It is composed of aluminum and potassium in the hydrated form and is part of the mica family. It can be found in igneous, metamorphic, and sedimentary rocks.
Rocks are massive structures which could be found above or below the earth's surface. They are formed by molten magma or by the deposition of materials in layers overtime. Some types of rocks are formed from changes in existing rocks.
The Muscovite could be used in cosmetics as well as to make a paint to shine The chemical formula of muscovite is given as (KF)₂(Al₂O₃)₂(SiO₂)(H₂O). We can see that it contains the elements aluminum, potassium and silicon.
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If you substituted the carbonyl in the peptide bond with a c-f bond, what would happen to the arrangement of an antiparallel beta sheets?
If you substituted the carbonyl in the peptide bond with a C-F bond, the strands would get closer together.
All of the amino acids could form a hydrogen bond with another amino acid in the chain to stabilize the secondary structure of a b-pleated sheet.
Protein is composed of amino acid linked with peptide bond.
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as fluorine (F), oxygen (O) and nitrogen (N) atoms.
In a beta-pleated sheet, hydrogen bonds are formed between carbonyl and amino groups of backbone (see picture below).
Fluorine atom has greater electronegativity than oxygen atom in carbony group, so the hydrogen bond with hydrogen atom is shorter and strands are closer.
Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.
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A recipe for spaghetti sauce requires 2.5 cups of tomato sauce. If only metric
measures are available, how many milliliters of tomato sauce is needed?
(1qt = 4 cups, 1q = 946 mL)
The volume of the sauce required is 529.76 mL
What is the volume?
The volume has to do with the space that is occupied by an object. We can see that the unit that has been given for the spaghetti sauce is in the non standard unit of cups of tomato sauce. We are now asked to express this value in the metric unit of milliliter.
We have that;
1qt = 4 cups
x = 2.5 cups
x = 1qt * 2.5 cups/4 cups
x = 0.56 qt
Also;
1q = 946 mL
0.56 qt = 0.56 qt * 946 mL/1q
= 529.76 mL
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ASAPPPP EASYYYY!!!
Total number of single, double, and triple bonds for C2H6(g).
_ _ _
Answer:
2 single, 0 double, and 1 triple
Explanation:
H-C≡C-H
a given mass of gas has a volume of 310cm³ at s.p.t. calculate it's volume under the following conditions;
242k and 840mmHg
Volume under the following condition is 280.47 cm³.
STP, or standard temperature and pressure, refers to the nominal atmospheric conditions at sea level. The temperatures and pressures are 0 degrees Celsius and 1 atmosphere, respectively.When standard state conditions are used, STP conditions are crucial for calculating and expressing fluid flow rates as well as the quantities of liquids and gases.A gas law known as Boyle's law asserts that a gas's pressure is inversely proportional to its volume when it is held at a fixed temperature and of a given mass. P ∝ (1/V)P is the pressure the gas is exerting, and V is the volume it is occupying. By including the constant k, this proportionality can be transformed into an equation.Given,
intial volume is 310cm³
temperature is 242K
final pressure is 840mmHg
pressure at STP is 1atm or 760mmHg
we have to find out volume at final pressure
Use Boyle's law
P1 * V1 = P2 * V2
Put the values from the question
760* 310 = 840 * V2
V2 = 760* 310 / 840
V2 = 280.47 cm³
Therefore, volume at final pressure is 280.47 cm³.
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what is the element ?
Answer:
like a element is like water
Answer:
periodic table
Body System virtual lab can someone help me I will give brainlest
What is the nervous system?
The nervous system is made up of the brain, spinal cord and nerves. It controls much of what you think and feel and what your body does. It allows you to do things like walk, speak, swallow, breathe and learn. It also controls how the body reacts in an emergency.
What is the digestive system?
The organs that take in food and liquids and break them down into substances that the body can use for energy, growth, and tissue repair. Waste products the body cannot use leave the body through bowel movements.
Similarities (or how they function together):
When we eat, our brain sends signals to our digestive tract so that it can break down what we eat into smaller molecules for absorption into our bloodstream. The nervous system controls the digestive system by sending signals to the brain and organs.
Differences:
The nervous system controls all your senses, and movements. While the digestive system controls your food
I hope that helped!
A pure titanium cube has an edge length of 2.81 in . how many titanium atoms does it contain? titanium has a density of 4.50g/cm3.
There are 2.05×[tex]10^{25}[/tex] titantium atoms in the cube.
How dense are atoms?Electrons are present in atoms. True, a large portion of the mass of an atom is concentrated in its tiny nucleus, but this does not imply that the rest of the atom is empty. It rather implies that the rest of the atom has a low density.STEP 1. Converting inches to cm
length in cm = 2.81 in*(2.54cm/1 in)
length in cm =7.1374
STEP 2: Determining mass of cube from the density
density = mass/volume
mass = density * volume
mass = 4.50 g/cm^2*(7.1374 cm) ^3
mass = 1635.18 g
STEP 3: Converting mass of titanium cube to number of atoms
no. of. Ti. atoms = 1636.18 g Ti * ( [tex]\frac{1 mol Ti}{47.867 g}[/tex]) ([tex]\frac{6.022*10^{23} atoms}{1 mol Ti}[/tex])
no. of. Ti. atoms = 2.058*10^25 atoms
Since the given values have 3 significant figures, the final answer must be:
no. of. Ti. atoms = 2.05*10^25 Ti atoms.
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How many grams of solid sodium carbonate (na2co3, 105.99 g/mol) would be required to neutralize 1.0 l of 1.0 m hcl?
53 grams of solid sodium carbonate would be required to neutralize HCl.
Balanced chemical equation:
2HCl(aq) + Na₂CO₃(aq) → NaCl(aq) + H₂O(l) + CO₂(g)
V(HCl) = 1.0 l; volume of the hydrochloric acid
c(HCl) = 1.0 M; concentration of the hydrochloric acid
n(HCl) = c(HCl) × V(HCl)
n(HCl) = 1 mol; amount of the hydrochloric acid
From the balanced equation: n(HCl) : n(Na₂CO₃) = 2 : 1
n(Na₂CO₃) = 1 mol ÷ 2
n(Na₂CO₃) = 0.5 mol; amount of sodium carbonate
m(Na₂CO₃) = n(Na₂CO₃) × M(Na₂CO₃)
m(Na₂CO₃) = 0.5 mol × 105.99 g/mol
m(Na₂CO₃) = 53 g; mass of sodium carbonate
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If you start with 0.10 mol of sulfur in the reaction vessel how many moles of oxygen would need to be added to form so2 , assuming so2 forms exclusively?
The number of mole of oxygen needed for the reaction is 0.1 mole
Balanced equationWe'll begin by writing the balanced equation for the reaction. This shown below:
S + O₂ --> SO₂
From the balanced equation above,
1 mole of S required 1 mole of O₂
How to determine the mole oxygen neededThe mole of oxygen needed to react with 0.1 mole of sulphur can be obatined as follow:
From the balanced equation above,
1 mole of S required 1 mole of O₂
Therefore,
0.1 mole of S will also require 0.1 mole of O₂
Thus, 0.1 mole of O₂ is needed for the reaction
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Specifying a(n) ____ solution to a problem allows us to take advantage of the speed and power of a computer system to automate the solution.
Specifying an algorithmic solution to a problem allows us to take advantage of the speed and power of a computer system to automate the solution.
Algorithmic solutions are those that attempt to tackle a problem in a number of steps. To arrange an array in ascending order, for example, a sequenced order of steps is used, so this is an algorithmic solution.
An algorithm is a method of describing the sequential execution of computer issues. It can be compared to a recipe in which the stages for food preparation are specified. The algorithm includes multiple aspects of a program like input, computations, repetitive structures, variable initialization, and mathematical outputs. It is later transformed into flowcharts and programs.
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What conditions are required for the formation of diamonds?
O great pressure squeezing atoms together
O heat and volcanic gases
O hot water
O dead plant and animal material
3. The arrangement of particles demonstrated in the box on the right is called a hydration shell. In effect the copper metal becomes a complex ion with its surrounding water molecules. For metals other than group I and II, some water molecules are ripped apart due to their close association with the ions resulting in some H ions ending up in solution. This process can be expressed in the reaction shown below and can be called hydrolysis. What does the double arrow shown in the reaction tell us about the completion of the reaction, and what is actually found in the beaker: reactants, products, or both? (1) Cu(H₂O)6^2+ [Cu(H₂O)5(OH)]^+ + H+
In the beaker, we would find both reactants and products.
What is a reaction?The term reaction has to do with an interaction between reactants to give products. Sometimes, there is only a single reactant as we can see in the equation written as follows; [tex][Cu(H_{2} O)_{6} ]^{2+} ------- > [Cu(H_{2} O)_{5} (OH^-)]^+ + H^+[/tex]
In this case, a hydrogen ion leaves one of the water ligands to yield the species on the left hand side of the reaction equation. The double arrow in the reaction implies that this is a reversible reaction. A reversible reaction is one that could go either forward or backwards.
In a state of dynamic equilibrium, we always have the reactants and the products in the beaker. This is because, reactants are being converted to products and products to reactant at the same rate.
Hence in the beaker, we would find both reactants and products.
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The mass required to trigger a mouse trap is 157g. what is the largest mass of cheese a 4 oz. mouse could carry and not set off the trap?
Given,
Mass required to trigger a mouse trap =157grams
Mass of mouse = 4 ounces (oz)
we need to find the largest mass of cheese a mouse should carry to not set off the trap-
Firstly, we need to convert oz into grams
⇒ 4 x 28.3 = 113.2 grams
∴Mass of cheese in grams = 113.2
For the mouse to not set off the trap, mass of mouse + mass of cheese should be less than 157 grams.
⇒113.2 + mass of cheese < 157
⇒ Mass of cheese < 157 - 113.2
Mass of cheese < 43.8 gm
Hence, the mouse should carry a cheese of 43.8 grams to not set off the trap.
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The mouse should carry a 43.8 grams block of cheese in order to avoid setting off.
Given,
A mouse trap requires 157 grams of mass to set off.
Mouse weight is 4 ounces (oz)
To avoid setting off the trap, we need to determine how much cheese a mouse should be able to carry.
First, we must change an ounce into grams.
4 x 28.3 equals 113.2 grams.
The mass of cheese is 113.2 grams.
Mass of mouse plus mass of cheese must be less than 157 grams for the mouse to avoid setting off the trap.
113.2 + cheese mass equals 157.
157 cheese mass - 113.2= 43.8 g of cheese total.
Hence, In order to avoid setting off the trap, the mouse should carry a 43.8-gram block of cheese.
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Draw a phylogenetic tree with 5 otus, label the nodes, include one polytomy, and circle aclade
Nodes are the points at the endpoints of branches that, at various moments in evolutionary history, represent potential or actual sequences.
A cladogram inner node that contains more than two immediate descendents on either side of it is referred to technically as having polytomy (i.e, sister taxa).
An organism and all of its offspring make up a clade. A "clade" would include all descendant species of the common ancestor of apes, for instance. Clade is derived from the Greek word klados, which means "branch" in English.
What is phylogenetic tree?
A phylogenetic tree is a branching diagram that shows the evolutionary links among various biological species. It is also referred to as an evolutionary tree or a phylogeny.
The idea that life evolves from lower to higher tiers like a ladder, referring to it be like the Great Chain of Being, is an outdated view of the "tree of life" that phylogenetic trees are known as. An early phylogenetic tree that includes a paleontological chart can be seen as a branching tree in early perceptions, drawings, and sketches. This mainly demonstrated how plants and animals have geological connections and relationships.
Nodes are the points at the endpoints of branches that, at various moments in evolutionary history, represent potential or actual sequences.
A cladogram inner node that contains more than two immediate descendents on either side of it is referred to technically as having polytomy (i.e, sister taxa).
An organism and all of its offspring make up a clade. A "clade" would include all descendant species of the common ancestor of apes, for instance. Clade is derived from the Greek word klados, which means "branch" in English.
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Which is the method of separating colouring ingredients in a sauce?
Answer:
Chromatography is a method of separating out materials from a mixture. Ink is a mixture of several dyes and therefore we can separate those colors from one another using chromatography. When ink is exposed to certain solvents the colors dissolve and can be seperated out.
0.45 g of hydrogen chloride ( hcl ) is dissolved in water to make 2.0 l of solution. what is the ph of the resulting hydrochloric acid solution? express the ph numerically to two decimal places.
The pH of the resulting solution formed by mixing HCl in water is 2.40.
The term pH, which stands for the potential of hydrogen, refers to a measurement of a substance's concentration of hydrogen ions (also known as protons). The pH of a solution provides important clues about its chemical makeup. Nutrient availability, biological function, bacterial behavior, and chemical behavior can all be impacted by pH.
pH = -log[H+], where [H+] is the concentration of H+ ions, is the formula used to determine the pH of any solution. The concentration of H+ ions is equal to the concentration of HCl because HCl is a strong acid and exhibits full dissociation.
Given mass of HCl = 0.45 g
Volume of solution = 2.0 L
We calculate the concentration of H⁺ ions as below:
M = n/V, where
V = volume
n = no. of moles
And no. of moles will be calculated as:
n = W/M, where
W = given mass
M = molar mass
Moles of 0.45 g of HCl = 0.45 g / 36.5g/mol = 0.0123mol
Now we put all these values in the above equation of concentration as:
M = 0.0123mol / 2.0L = 0.0061 M
We will put these values of concentration of H⁺ ions in the pH equation as:
pH = -log(0.006) = 2.22
Hence, 2.22 is the value of pH.
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Identify bond-line structures for constitutional isomers with a molecular formula of c4h11n
Eight isomers are possible for the bond-line structures for constitutional isomers with a molecular formula of c4h11n
n-butylamine
sec-butylamine
isobutylamine
tert-butylamine
N-methyl-n-propylamine
N-methylisopropylamineamine
N, N-diethyl amine
N-ethyl-N,N-dimethylamine
one of two or more compounds, radicals, or ions containing the same number of atoms of the same element but differing in structural arrangement and properties That is, they have exactly the same molecular formula, but the atoms are arranged differently.
n-butane and isobutane are examples of structural isomers, as are ethanol and dimethyl ether. Constitutional isomers can also have different functional groups.
Constitutive isomers are molecules with different connections. It resembles a simple bracelet with different orders of red and green beads. The second type is stereoisomers. Stereoisomers have the same connectivity but differ in the spatial orientation of the parts.
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Which one of the following pairs cannot be mixed together to form a buffer solution? explain why.
a. hno3, nano3
b. sr(oh)2, nahso4
c. na3po4, na2hpo4
d. nh3, nh4cl
e. na2so4, khso4
RbOH, HBr cannot be mixed together to form a buffer solution.
What is meant by Buffer Solutions?The pre-equivalence point in the titration of a weak acid is identified by a buffering area. The buffering area forms because of the presence of a conjugate acid-base pair. The pH just slightly changes at this point. Due to this, we may use the Henderson-Hasselbalch Equation to estimate the pH at the pre-equivalence point. Additionally, buffer solutions are frequently used in biochemical investigations to keep the pH within a specific range.Strong base (RbOH) and strong acid make up the duo (HBr). We are unable to create a buffer solution as a result. You can create buffer solutions by mixing a weak acid with its conjugate base. The conjugate base or acid is frequently provided as a salt. For instance, option A includes a conjugate acid-base pair in which the ammonium ion is the weak acid and ammonia is the weak base.Hence, RbOH, HBr cannot be mixed together to form a buffer solution.
option C is correct.
The correct question is,
Which one of the following pairs cannot be mixed together to form a buffer solution?
A) NH3, NH4CI
B) NaC2H3O2, HCl (C2H3O-2)
C) RbOH, HBr
D) KOH, HF
E) H3PO4, KH2PO4
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A chemist wants to determine the molar mass of a naturally occurring substance isolated from spearmint. She adds 4.231 g of this substance to 25.00 g of acetone (C3H6O; molar mass 58.08 g/mol). The vapor pressure of the solution is determined to be 0.2474 atm at 25°C. If the vapor pressure of pure acetone at this temperature is 0.2630 atm, what is the mole fraction of the solvent in this solution? Give your answer to four significant digits.
The molar mass is 151 g/mol.
What is Raout's law?The Raout's law is used to describe the relationship between the partial pressures of the solution and that of the solute. Given that we have the partial pressure of the pure solvent is 0.2630 atm and the partial pressure of the solution is 0.2474 atm
Using Raout's law;
Psolution = Psolvent * mole fraction
Number of acetone = 25.00 g/58.08 g/mol = 0.43 moles
Number of substance = 4.231 g/ MM
Where MM = molar mass
0.2474 atm = 0.2630 atm * Moles of acetone/Total number of moles
Let the Moles of substance be x
0.2474 atm = 0.2630 atm * 0.43/0.43 + x
0.2474 = 0.113/0.43 + x
0.2474(0.43 + x) = 0.113
0.106 + 0.2474x = 0.113
0.2474x = 0.113 - 0.106
x = 0.113 - 0.106/0.2474
x = 0.028
Then;
x = 4.231 / MM
0.028 = 4.231 / MM
MM = 4.231 / 0.028
MM = 151 g/mol
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The energy levels in which electrons orbit around the ____________ are also called ____________ .
The energy levels in which electrons orbit around the nucleus are also called electron shells.
All atoms contain electrons, protons and neutrons. The protons and neutrons are located in the center of the atom called the nucleus. Electrons orbit around the nucleus in electron orbits or shells.
Electron shells or energy levels are the paths followed by electrons as they orbit round the nucleus. The shells are used to determine an atom's electronic configuration and atomic structure.
The shells in an atom are given a number, starting from the innermost shell to the outermost shell, called the principal quantum number, denoted with the letter n. The farther away a shell is from the nucleus, the higher the energy level and the higher the principal quantum number.
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Guys please help me ‼️‼️
How old are atoms that are made up in a car???
The atoms made up in a car are as old as the car.
Cars are made up from metals and elements which are made up of atoms.
Atoms, which are little bits of matter, are what distinguish one chemical element from the others. A negatively charged core nucleus and one or more orbiting electrons make up an atom. The positively charged nucleus houses one or more protons and neutrons, which are relatively heavy particles.
Any material with mass and volume is considered matter because it occupies space. The observable cosmos is made up of matter, which coupled with energy serves as the foundation for all objective occurrences.
Car is consequently matter comprised of atoms.
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Phosphorus is atomic number 15. when it comes to bonding with other atoms, what is phosphorus most likely to do?
Phosphorus shares its valence electrons with other elements to form a covalent bond.
The electronegativity of an element largely determines its capacity for sharing or donation of electrons thereby forming covalent bond or ionic bond. Additionally, the charge to mass ratio is a major factor in this electronegativity.
The atomic number of phosphorus is 15, and its mass is 31. It is therefore a large atom with low electronegativity. Therefore, if a highly electropositive atom does not arrive to complete its electron needs, it is unable to take three electrons from other atoms to fulfil its charge. Thus, it favours sharing in most cases forming covalent bonds.
Phosphorus typically has 5 valence electrons, and the final 3 are required to complete its octet. It does, however, possess an open d-sub shell where its electrons can be excited, changing its number of valence electrons from 3 to 5. As a result, it shares those 5 electrons with the other elements to create 5 covalent bonds.
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Calculate the molarity of a 16. 45 g sample of nacl is dissolved in enough water to make 1. 000 l of solution
When 16.45 g sample of NaCl is dissolved in enough water to make 1.000 l of solution, the solution has a molarity equal to 0.2815 moles NaCl/L solution.
Molarity, or molar concentration, is defined as the number of moles of solute per liter of solution. It can be calculated using the formula given by:
M = n/v
where M = molarity
n = number of moles of solute
v = volume of solution
If the mass of the solute NaCl is 16.45 g, divide it with the molar mass of NaCl to get the number of moles of solute.
n = m/MM
n = 16.45 g/58.44 g/mol
n = 0.2814852841 moles NaCl
If 0.2814852841 moles NaCl is dissolved in enough water to make 1. 000 l of solution, solve its molarity.
M = n/v
M = 0.2814852841 moles NaCl/1.000 l solution
M = 0.2814852841 moles NaCl/L solution
M = 0.2815 moles NaCl/L solution
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A 0.613 m solution of a weak acid has a ph of 2.708 at 303 k. what is the ka of the weak acid?
The Ka of the weak acid is 6.28 × 10⁻⁶.
Ka is the acid dissociation constant, which quantifies the extent of acid dissociation in water.
Balanced chemical reaction (dissociation) of an aqueous solution of a weak acid:
HA(aq) ⇄ H⁺(aq) + A⁻(aq)
pH = 2.708
c(H⁺) = 10⁻²°⁷⁰⁸
c(H⁺) = 1.96 × 10⁻³ M; concentration of hydrogen ions
c(H⁺) = c(A⁻); from balanced chemical reaction
c(HA) = 0.613 M - 1.96 × 10⁻³ M
c(HA) = 0.611 M; concentration of an acid in the solution
Ka = c(H⁺) × c(A⁻) / c(HA)
Ka = (1.96 × 10⁻³ M)² / 0.611 M
Ka = 6.28 × 10⁻⁶; the acid dissociation constant
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Bohr’s model of the hydrogen atom, which restricts electrons to circular orbits around the nucleus parameterized by a single number, n, can best be applied to which other species?.
Bohr’s model of the hydrogen atom, which restricts electrons to circular orbits around the nucleus parameterized by a single number, n, can best be applied to any atom with one electron.
He⁺, Li²⁺, and Be³⁺ are examples of such atoms.
According to Bohr's atomic model, electrons revolve around the nucleus without emitting energy. K, L, M, and N are used to describe the energy shell. The energy is emitted or absorbed only when an atom jumps to a higher or lower orbit.
The energy equation is:
ΔE = hv
Where ΔE is the change in energy, h is the Planck constant, and v is the frequency.
If you need to learn more about Bohr's Atomic model, click here
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