A PH 488 Buffer Was Prepared by Dissolving 0

question 78

Multiple Choice

A pH 4.88 buffer was prepared by dissolving 0.10 mol of benzoic acid (Ka = 6.3 × 10^-5) and 0.50 mol of sodium benzoate in sufficient pure water to form a 1.00 L solution. To a 70.0 mL aliquot of this solution was added 2.00 mL of 2.00 M HI solution. What was the pH of the new 72.0 mL solution?

• A) 2.84
• B) 3.16
• C) 3.36
• D) 4.65
• E) 4.90

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