Los Angeles Harbor College » Chemistry » Chem 065 - Introductory General Chemistry » Winter 2024

Question #1

Identify the Brønsted-Lowry acids in the following reaction. H2O + CO32- → HCO3- + OH-

A. OH-/HCO3-

B. H2CO3/H2O

C. CO32-/HCO3-

D. H2O/HCO3-

E. CO32-/OH-

Question #2

Which of the following is correctly identified?

A. NH3, strong acid

B. H2CO3, strong acid

C. NaOH, strong base

D. Ca(OH)2, weak base

E. HCl, weak acid

Question #3

What is the [OH-] in a solution that has a [ H3O+] = 2.0 × 10-4 M?

A. 5.0 × 10-11 M

B. 1.0 × 10-10 M

C. 2.0 × 10-4 M

D. 5.0 × 10-10 M

E. 2.0 × 10-10 M

Question #4

A solution which has [OH-] = 3.4 × 10-12 M is

A. acidic

B. neutral

C. basic

Question #5

What is the molarity of a KOH solution if 25.0 mL neutralizes 35.0 mL of a 0.200 M HCl solution?

A. 0.200 M

B. 0.100 M

C. 0.143 M

D. 0.267 M

E. 0.280 M

Question #6

Which of the following could be a buffer?

A. HF + H2O

B. NaF

C. NaF + H2O

D. NaCl + HF

E. HF + NaF