Chemistry College

Two samples of the same rainwater are tested using two indicators at an environrnental lab. The first indicator, Methyl Orange, reveals a distinct yellow color when added to the sample. The second indicator, Litmus, turns red when placed in contact with the water sample.

Required:
a. Identify a possible pH value for the rainwater.
b. Explain, in terms of hydronium ions and hydroxide ion concentrations, the pH value of the rainwater.

Answers

Answer 1

Answer:

A. The pH value of rainwater is acidic about 4.4

B. The molar concentrations of the Hydronium ions are more than that of the hydroxide ions. That is why the rainwater is acidic with a pH of less than 7

Explanation:

A. Methyl orange is an acid indicator that is used to detect acidic solutions which have pH values that fall within the range of about 4.4 to 7.  The distinct yellow colour change that was shown by the methyl orange as it was added to the water shows that the pH value is acidic, with a value above 4.4. (it has to be like this before methyl orange changes to  yellow colour)

B. The Hydronium ( H30+) ion concentrations and the hydroxide (OH-) ion concentrations are used to measure the pH values of substances.

We can tell that the Hydronium ( H30+) ion concentrations are more than the hydroxide (OH-) ion concentrations in the sample of rainwater tested. This can be detected from the colour change that both the methyl orange and the litmus paper gave. The indicators showed that the rainwater solution was indeed acidic. Hence, the pH value will be less than 7, but greater than 4.4.

Related Questions

At 25.0 °C the Henry's Law constant for sulfur hexafluoride (SP) gas in water is 2.4x 10 M/atm Calculate the mass in grams of SFo, gas that can be dissolved in S25. ml. of water at 25.0 C and a SF, partial pressure of 1.90 atm Be sure your answer has the correct number of significant digits.

Answers

Complete Question

The complete question is shown on the first uploaded image

Answer:

The mass is [tex]m = 0.0349 \ g[/tex]

Explanation:

From the question we are told that

   The Henry's Law constant is  [tex]k = 2.4 *10^{10} M/atm[/tex]

   The volume of water is [tex]V = 525 \ ml = 0.525 \ L[/tex]

   The partial pressure is  [tex]P = 1.90 \ atm[/tex]

   The temperature is [tex]T = 25 ^oC[/tex]

Henry's  law is mathematically represented as

       [tex]C = P * k[/tex]

Where C is  the concentration of sulfur hexafluoride(SP)

substituting value

        [tex]C = 1.90 * 2.4*10^{-4}[/tex]

        [tex]C = 4.56*10^{-4} \ M[/tex]

The number of moles of  SP is mathematically represented as

        [tex]n = C * V[/tex]

substituting value

       [tex]n = 0.525 * 4.56*10^{-4}[/tex]

       [tex]n = 2.39 *10^{-4} \ moles[/tex]

The mass of SP that dissolved is

          [tex]m = n * Z[/tex]

Where Z is the molar mass of SP which has a constant value of

           [tex]Z = 146 g/mole[/tex]

So

         [tex]m = 2.394*10^{-4} * 146[/tex]

         [tex]m = 0.0349 \ g[/tex]

Arrange the measurements from least to greatest

Answers

Answer: 1.8 micrograms, 1.8 milligrams, 1.8 grams, 1.8 kilograms

Explanation:

What must happen for an ionic bond to be created between two elements?

Answers

Answer:

they must be heated

Explanation:

Why is tape attracted to my skin? Give explanation

Answers

Answer:

Since the tape has extra electrons, it has a negative charge. When you move your finger close to the tape, electrons in your skin are repelled and move away. This makes the skin on your finger tip have a slight positive charge. Since positive and negative attract, the tape moves toward your finger.

Other Questions
25.1.2 Exam: Semester ExamQuestion 13 of 252 PointsWhich news headline is most clearly biased?A. Rock Star Says to Record Company, "Get Lost!"B. Statistics Show Growing Support for LawC. Local Thugs Suspected of VandalismO D. Car Catches Fire Outside New Orleans Find the surface area of the cylinder. Round your answer to the nearest tenth. Radius-8ft hieght-9ftthanks! What are the x- and y- coordinates of point P on the directed line segment from K to J such that P is Three-fifths the length of the line segment from K to J Adjustment for Unearned Revenue On June 1, 20Y2, Herbal Co. received $41,250 for the rent of land for 12 months. Journalize the adjusting entry required for unearned rent on December 31, 20Y2. Set up an Unearned Fees T-account. Recall that the unearned revenue account is decreased (debited) for the amount of the revenue that has been earned, and the related revenue account is increased (credited). The balance before adjustment will be the normal balance for the unearned liability account. The number given for the end of the year is to be the new balance after adjusting out the revenue earned. What amount is this difference between the pre-adjustment balance and the post-adjustment balance? how many chromosomes will an elephant's sperm have ? mt TeacherebookSickle Cell anemia is a disease caused by a recessive allele. What is the chance a child will have Sickle Cell if oneparent has it, and the other parent does not and is homozygous.A. 75%B. 33%C. 0%OD. 100% What substance influences the reaction but does not participate in the reaction Kat Outfitting currently has $22,500 in cash. The company owes $49,500 to suppliers for merchandise and $52,500 to the bank for a long-term loan. Customers owe the company $41,000 for their purchases. The inventory has a book value of $76,800 and an estimated market value of $72,000. If the store compiled a balance sheet as of today, what would be the book value of the current assets? please send me labeled scorpion What does it mean to have a true friend (which I need) Can anyone put this in order Chlorophylls are a type of pigment, a substance that absorbs light. What colorare chlorophylls, which color of light do they absorb, and where are they located in the cell?A. Chlorophylls are green but absorb red, violet, and blue light and are found throughout the chloroplast.B. Chlorophylls are red, violet, and blue, but absorb green light and are found in the thylakoid membranes of the chloroplast.C. Chlorophylls are red, violet, and blue, but absorb green light and are found throughout the chloroplast.D. Chlorophylls are green but absorb red, violet, and blue light and are found in the thylakoid membranes of the chloroplast. Are theses exaponents correct!??? 20 points What is the antagonist in a story? PLEASE HELP ASAP g Question 6 1 pts A 3x3 matrix with real entries can have (select ALL that apply) Group of answer choices three eigenvalues, all of them real. three eigenvalues, all of them complex. two real eigenvalues and one complex eigenvalue. one real eigenvalue and two complex eigenvalues. only two eigenvalues, both of them real. only two eigenvalues, both of them complex. only one eigenvalue -- a real one. only one eigenvalue -- a complex one. still really need help with these three questions!! This chemical equation represents the burning of methane, but the equation is incomplete. What is the missing coefficient in both the reactants and the products?CH4 + ____O2 CO2 + ____H2OA. 0B. 1C. 2D. 3E. 4 Identify several examples of popular culture and describe how they inform larger culture. How prevalent is the effect of these examples in your everyday life? How do you think the four tissue types support the function of the heart? How do the different tissue types support the idea that systems of specialized cells are critical for body functions? Here is a number machine. Write down an expression for the output if the imput is n. input=n) (+2) (x3) (output=?