CHM 1046 Lecture 1: Chem Notes 17 1-22 101614(3)

1. What is the conjugate base for HNO₂?

a. HNO₃

b. H₂NO₂

c. NO₂^-

d. NO^-2

2. Which of the following is a conjugate acid/base pair?

A. HCl/OCl-

B. H₂SO₄/SO₄^2-

C. NH₄⁺/NH₃

D. H₃O⁺/OH^-

3. Given the following acids and Ka values:

HCN =  4.93 x 10^-10

HF = 3.53 x 10^-4

HOAc =  1.76 x 10^-5 

Which acid is the strongest?

A. HOAc

B. HCN

C. HF

D. All are equally strong

4. Calculate the [H⁺] in a solution that has a pH of 11.70

A. 2.3 M

B. 11.7 M

C. 5 x 10^-3 M

D. 4 x 10^-11 M

E. 2 x 10^-12 M

5. The pH of a solution in which the [OH^-] = 3.4 x 10^-5 M is

A. 4.5

B. 10.5

C. 9.5

D. 6.3

E. 12.1