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The pH of a solution that contains 0.818 M acetic acid (Ka = 1.76 x 10-5) and 0.172 M sodium acetate is __________. The Ka of acetic acid is 1.76 ˛ 10-5.

• 9.922

• 5.432

• 4.077

• 8.568

• 8.370

Of the following solutions, which has the greatest buffering capacity?

• 0.121 M HF and 0.667 M NaF

• 0.821 M HF and 0.909 M NaF

• 0.821 M HF and 0.217 M NaF

• 0.100 M HF and 0.217 M NaF

• They are all buffer solutions and would all have the same capacity.

Calculate the pH of a solution prepared by dissolving 0.37 mol of formic acid (HCO2H) and 0.23 mol of sodium formate (NaCO2H) in water sufficient to yield 1.00 L of solution. The Ka of formic acid is 1.8 x 10-4.

• 2.30

• 10.46

• 2.09

• 3.95

• 3.54

The addition of hydrofluoric acid and __________ to water produces a buffer solution.

• HCl

• NaNO3

• NaCl

• NaBr

• NaF

Which of the following could be added to a solution of sodium acetate to produce a buffer?

acetic acid hydrochloric acid potassium acetate sodium chloride

• hydrochloric acid only

• sodium chloride or potassium acetate

• acetic acid only

• acetic acid or hydrochloric acid

• potassium acetate only