Quiz 6, Acids and Bases

A solution is prepared by combining 50.0 mL of 0.025 M HCl and 70.0 mL of 0.045 M HNO3 and diluting to 1.6 L. What is the pH of the resulting solution?

a. 1.15
b. 1.35
c. 1.60
d. 2.56
e. 2.75

Select your answer: a. b. c. d. e. Number of points 3
At 25oC, a solution of benzoic acid, HC7H5O2 , has a pH of 2.80. What is the initial concentration of HC7H 5O2 in the solution?


Number of points 3
Sodium hydrogen sulfate, NaHSO4, is used in cleaning metals and tanning leather. Which of the following statements about a 0.10 M NaHSO4 solution is false? Ka for HSO4- is 0.012.

a. NaHSO4 is a soluble salt.
b. HSO4- is a weak acid.
c. The [H+] in the solution is less than 0.10 M.
d. At equilibrium, the dissociation of HSO4- is significantly less than 5%.
e. HSO4- is the conjugate base of H2SO4.

Select your answer: a. b. c. d. e. Number of points 2
The Ka for a weak acid, HA, is 4.2 x 10-10. What percent of HA is dissociated in a 1.0 x 10-2 M solution of the weak acid?


Number of points 1
Whic of the following statements is/are true?

a. A Lewis base is an electron pair acceptor.
b. CaO will form a basic solution when dissolved in water.
c. A 1.0 x 10-10 M HBr solution has a pH greate than 7.
d. Both a and d are true.
e. All of the above statements, a, b and c, are true.

Select your answer: a. b. c. d. e. Number of points 3
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