REVIEW PROBLEMS ACIDS WORKSHEET 26 (PRACTICE)

1. Using the Ka values, calculate the percent dissociation in a 0.20 M solution of each of the following acids.

a. nitric acid (HNO3) b. nitrous acid (HNO2) Ka = 4.1 x 10-4 c. phenol (HOC6H5) Ka = 1.6 x 10-10 d. How is the percent dissociation related to the Ka value for the acid?

2. Calculate the pH of a solution that contains 1.5 M HF and 2.0 M HOC6H5. Also calculate the concentration of OC6H5

- in this solution at equilibrium.

Ka for HF is 7.2 x 10-4

Ka for HOC6H5 is 1.6 x 10-10

3. Calculate [OH-], [H+], and the pH of a 0.20 M solutions of each of the following amines. a. Triethylamine [(C2H5)3N, Kb = 4.0 x 10-4] b. Hydroxylamine (HONH2, Kb = 1.1 x 10-8]

4. Sodium azide (NaN3) is sometimes added to water to kill bacteria. Calculate the concentration of all species in a 0.010 M solution of NaN3. The Ka value for hydrozoic acid (HN3) is 1.9 x 10-5.