Answer:
When water dissolves a substance, the water molecules attract and “bond” to the particles (molecules or ions) of the substance causing the particles to separate from each other. The “bond” that a water molecule makes is not a covalent or ionic bond. It is a strong attraction caused by water’s polarity.
Explanation:
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.
To learn more about dense of atoms refer to
https://brainly.com/question/24419453
#SPJ4
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.
Learn more about reaction:https://brainly.com/question/28270550
#SPJ1
What are the minimum numbers of terminals required on an integrated-circuit package containing three op-amps? group of answer choices
The minimum no of pins required by dual-op-amp is 8. Each op-amp has 2 input terminals(4 pins) and one output terminal(2 pins). Another 2 pins are required for power.
What is dual-op-amp?An operational amplifier is a high-gain, DC-coupled electronic voltage amplifier with differential input and typically single-ended output. An op amp in this setup generates an output potential (relative to circuit ground) that is typically 100,000 times greater than the potential difference between its input terminals. Operational amplifiers were first employed in analog computers to carry out mathematical operations in linear, non-linear, and frequency-dependent circuits.
The op amp's popularity as a component in analog circuits stems from its adaptability. By adopting negative feedback, the properties of an op-amp circuit, such as its gain, input and output impedance, bandwidth, etc., are defined by external components and have no influence on temperature coefficients or technical tolerance in the op amp itself.
To learn more about dual-op-amp from the given link:
https://brainly.com/question/16190769
#SPJ4
What volume in ml of 0.3000 m nacl solution is required to produce 0.2150 moles of nacl?
710 mL volume in ml of 0.3000 m nacl solution is required to produce 0.2150 moles of nacl.
What is meant by moles?In chemistry, a mole, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles. The mole designates 6.02214076 1023 units, which is a very large number. The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities. The term "mole" refers to an extremely large quantity of molecules, atoms, or other particles and is used as a unit of measurement in chemistry.Molar Concentration = number of moles/ volume
volume = number of moles/ molar concentration
volume = 0.2150/ 0.3000 = 0.71 L
volume required = 0.71 L = 0.71L× 1000 mL/L = 710 mL
To learn more about Molar Concentration refer to:
https://brainly.com/question/14469428
#SPJ4
what happens when negative charge collied with neutral gas molecules in cathode ray tube?
Answer:
This collision makes the electron in the cathode free. These electrons undergo collision with neutral atoms of the gas and ionize them to form ions. The positive ions thus produced move toward the oppositely charged cathode and electrons move towards the anode
HOPE IT'S HELPS YOUWhat 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.
To learn more about temperature and specific heat, visit: https://brainly.com/question/18912282
#SPJ1
Which statement about the heliocentric theory is correct?
A. Heliocentric theory is a set of predictions describing the Sun as being the center of the solar system.
B. Heliocentric theory is a set of testable explanations describing the Sun as being the center of the solar system.
C. Heliocentric theory is a set of guesses describing the Sun as being the center of the solar system.
D. Heliocentric theory is a set of laws that describe the Sun as being the center of the solar system.
Please hurry I need this now T-T
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 height of water in a water barometer is 883 cm at 20˚c. The density of water at 20˚c is 0. 998 g•cm-3. What is the pressure?.
The pressure is 8.81 cm of Hg.
The height of the water in the water barometer is h.
h = 883 cm = 8.83 m
The density of water at 20 ° C is p.
p = 998 g/cm³
The gravity of the earth is g.
g = 1 m/s²
The pressure is,
Pressure = Height × Density × Gravity
P = h × p × g
P = 8.83 × 9.98 × 1
P = 8.81 cm of Hg
Therefore, the pressure is 8.81 cm of Hg.
To know more about density, refer to the below link:
https://brainly.com/question/15164682
#SPJ4
A sample of a compound containing boron (b) and hydrogen (h) contains 7.078 g of b and 1.980 g of h. the molar mass of the compound is about 30 g. what is its molecular formula?
[tex]B_{1*2} H_{1*2} = B_{2} H_{2}[/tex] is required its molecular formula.
Boron can form how many bonds?As a result, boron frequently forms three bonds, BH 3 start text, end text, start subscript, 3, end subscript, with a total of six electrons in the outermost shell. This causes some unusual properties in boron compounds because they are "short of electrons."
First calculate the empirical formula and mass. Compare the molecular mass to the empirical mass to determine the molecular formula.
Empirical Formula
Calculate the moles of boron and hydrogen. (Molar masses: B = 7.078 g/mol; H = 1.980 g/mol)B: 6.444 g × 1 mol/ 7.078 g = 0.9104 mol
H: 1.803 g × 1 mol/1.980mol = 0.9106 mol
Calculate the mole ratios by dividing the moles of each element by the least number of moles.
B: 0.9104 mol/0.5961 mol = 1.5273
H: 0.9106 mol/0.5961 mol = 1.5276
The empirical formula is BH.
Calculate the empirical formula mass.
10.81 + (1 × 1.008) = 11.818
Molecular formula
30/11.818 = 2.5385 ≈ 2
Multiply the subscripts in the empirical formula by 2.
B₁ₓ₂[tex]H_{1}[/tex]ₓ₂ = B₂[tex]H_{2}[/tex]
This compound is diborane and its molar mass is 27.67 g/mol. If you go back and divide the molecular mass by the empirical mass, the result is 2.000. So B₂[tex]H_{2}[/tex]is the correct molecular formula. (27.67/ 11.818= 2.34).
To learn more about Molecular formula refer to
https://brainly.com/question/24419453
#SPJ4
Which of the responses includes all of the following that can form hydrogen bonds with water molecules? i. na , ii. ch3cooh, iii. c2h6, iv. ch3nh2
The responses that can form hydrogen bonds with water molecules are
II. CH₃COOH and IV. CH₃NH₂.
Acetic or ethanoic acid (CH₃COOH) has hydrogen atom bonded to an oxygen atom, so it can form hydrogen bonds with water molecules (see the picture below).
Methylamine (CH₃NH₂) has hydrogen atom bonded to a nitrogen atom, so it can form hydrogen bonds with water molecules.
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 flourine (F), oxygen (O) and nitrogen (N) atoms.
Sodium (Na) and ethane can not form hydrogen bonds, because they do not have a hydrogen atom bonded to flourine (F), oxygen (O) and nitrogen (N) atoms.
More about hydrogen bond: brainly.com/question/11679211
#SPJ4
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
Learn more about the molar mass:https://brainly.com/question/22997914
#SPJ1
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.
More about beta-sheet: brainly.com/question/5297569
#SPJ4
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.
To know more about pH refer to:
https://brainly.com/question/172153
#SPJ4
can anyone show the working steps?
Volume of potassium hydroxide that can neutralise 25 cm³ of H2Z acid solution is 5cm³
Diprotic acid is that acid which contains two hydrogen atoms and can release or ionise in water, such as carbonic acid and sulphuric acid.A neutralisation reaction is a chemical process in which an acid and a base combine to produce salt and water as the end products.The neutralization reaction is
H2Z + 2KOH → K2 H2Z + 2H2O
H2Z acid is diprotic acid as it has two ionizable hydrogens.
Thus, 1 mole of Z acid will neutralize 2 moles of KOH.
The number of moles of phosphorus acid present in 0.025 dm³ of 0.5 M aqueous solution is 0.1×
= 0.0025
They will neutralize 2×0.0025mol = 0.005 moles of KOH.
The molarity of KOH solution is 1.0 mol dm³
The volume of KOH solution required will be
1.0 × 0.005 = 0.005 dm³ = 5cm³
Hence, volume of KOH solution required will be 5 cm³.
learn more about neutralization reaction here:
https://brainly.in/question/15104847
#SPJ9
Why is it necessary to couple some biochemical reactions to the hydrolysis of atp (for example, in the synthesis of glutamine from glutamic acid)?
It is necessary to couple some biochemical reactions because individually some biochemical reactions have +ΔG and coupling them together makes helps to make the overall reaction -ΔG.
Reactions that have a positive value of Gibbs free energy, require additional energy to complete, which can be obtained when it is coupled with the hydrolysis of ATP.
Also, the biochemical reaction which has a negative value of ΔG is non-spontaneous in nature. For those to become spontaneous, the value of ΔG should be negative. The coupling of reaction makes their Gibbs free energy negative and makes them spontaneous.
Therefore it is necessary to couple biochemical reactions to the hydrolysis of ATP.
LEARN MORE ABOUT GIBBS FREE ENERGY HERE: https://brainly.com/question/9179942
#SPJ4
A fictitious element x has an average atomic mass of 122. 224 u. Element x has two naturally occuring isotopes. The most abundant isotope has an isotopic mass of 121. 560 u and a relative abundance of 63. 89%. Calculate the isotopic mass of the least abundant isotope
Element x is unbibium has an average atomic mass of 122. 224 u and isotopic mass of the least abundant isotope is 237.03
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons and the number of protons in a nucleus determines the element's atomic number on the periodic table called isotopes
Unbibium, also known as element 122 or eka-thorium, is the hypothetical chemical element in the periodic table with the placeholder symbol of Ubb and atomic number 122 and unbibium has two isotopes ³⁷⁴Ubb and ³⁷¹Ubb and this abundant isotope has an isotopic mass of 121. 560 u and a relative abundance of 63. 89% and the isotopic mass of the least abundant isotope is 237.03
Know more about isotopes
https://brainly.com/question/13402546
#SPJ1
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
Learn more about molarity here: https://brainly.com/question/14469428
#SPJ4
How many atoms of carbon (C) are present in the reactants of the following chemical equation?
C7H16+O2
CO2 + H₂O
(1 point)
O 7 atoms
16 atoms
O1 atom
O 23 atoms
The number of atoms present in reactants of the following chemical equation C₇H₁₆ + O₂ = CO₂ + H₂O is 7 atoms.
How to count number of atoms?The number of atoms in a compound is shown in the chemical formula of the compound.
A chemical formula is a notation indicating the number of atoms of each element present in a compound.
According to this question, the chemical reaction between heptane and oxygen is given as follows:
C₇H₁₆ + O₂ = CO₂ + H₂O
The chemical formula of hexane shows that carbon has 7 atoms in the reactant side.
Therefore, the number of atoms present in reactants of the following chemical equation C₇H₁₆ + O₂ = CO₂ + H₂O is 7 atoms.
Learn more about chemical formula at: https://brainly.com/question/11995171
#SPJ1
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
Learn more about volume:https://brainly.com/question/13338592
#SPJ1
how many atoms are in 7.2mol of sodium? step by step answer
Answer:
4.34 times 10^24
Explanation:
number of atoms=7.2 times Avogadro's number
=7.2 times 6.02 times 10^23
=4.34 times 10^24
Answer:
Explanation: we will multiple the amount of moles to the Avogadro's number for example:
7.2*6*10 to the power 23
CuSO4 + BaCl2 → BaSO4 + ?
BaCl2 + CuSO4 → BaSO4 + CuCl2
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.
Learn more about atoms here:
https://brainly.com/question/12904555
#SPJ4
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
Which solution has the higher boiling point: 26.4 g c2h6o2 in 0.500 kg of h2o or 22.0 g nacl in 0.500 kg of h2o?
The NaCl solution will have higher boiling point.
The temperature at which the vapour pressure equals the typical air pressure at sea level is known as the normal boiling point.
A molecular compound is [tex]C_{2} H_{6} O_{2}[/tex]. Meaning that it will continue to be in this state after dissolving:
[tex]C_{2} H_{6} O_{2}[/tex] ⇒ [tex]C_{6} H_{12} O_{6}[/tex] (aq)
Ionic materials include sodium chloride (NaCl). In other words, it will produce ions when it dissolves:
NaCl(s) ⇒ [tex]Na^{+}[/tex](aq) + [tex]Cl^{-}[/tex] (aq)
[tex]C_{2} H_{6} O_{2}[/tex] is a molecule and NaCl is an ionic substance. The boiling points of ionic compounds are higher than those of molecular molecules. NaCl will therefore have a higher boiling point.
Learn more about boiling point here:
https://brainly.com/question/2153588
#SPJ4
At stp, 1 mole of gas has a molar volume of 22.4 l. what is the density (g/l) of oxygen at stp?
The density of oxygen is 1.43 g/LC.
The periodic table's Group 16 (also known as the oxygen group) contains the nonmetallic chemical element oxygen (O). Oxygen is a colorless, odorless, and tasteless gas that is necessary for all living things. Animals take it up and then change it into carbon dioxide, which plants then use as a source of carbon and release the oxygen back into the atmosphere.
As well as reactions that remove elements from their combinations with one another, oxygen can react with nearly any other element to produce compounds. These reactions, which are frequently accompanied by the evolution of heat and light, are known as combustions. Water is the most significant component.
To learn more about oxygen please visit-
https://brainly.com/question/13370320
#SPJ4
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.
Learn more about Sublimation here https://brainly.com/question/4932952
#SPJ4
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
More about acid: brainly.com/question/17825334
#SPJ4
If an aqueous solution has a hydrogen ion concentration of 10^-5 what is the concentration of m hydroxyl ion?
The concentration of hydroxyl ion is 10^-9 M.
When an electrolyte is dissolved in water, it dissociates into ions.
In the above case, the ions are hydrogen (H+) and hydroxyl (OH-).
At a temperature of 298 K,
The ionic product(Kw of water is
Kw = [H+] [OH-] = 10^-14
Here [H+] = Concentration of hydrogen ions
[OH-] = Concentration of hydroxyl ions
Assuming that the above solution is at a temperature of 298 K, the ionic product(Kw) of water is
10^-14 = [10^-5] [OH-]
[OH-] = 10^-9.
Thus, the concentration of hydroxyl ions is 10^-9 M.
To know more about "ionic product of water", refer to the following link:
https://brainly.com/question/2776988?referrer=searchResults
#SPJ4
