A Solution Is Prepared by Dissolving 0

question 41

Multiple Choice

A solution is prepared by dissolving 0.23 mol of benzoic acid and 0.27 mol of sodium benzoate in water sufficient to yield 1.00 L of solution.The addition of 0.05 mol of HCl to this buffer solution causes the pH to drop slightly.The pH does not decrease drastically because the HCl reacts with the ________ present in the buffer solution.The K_a of benzoic acid is 1.36 × 10^-3.

• A)H₂O
• B)H₃O⁺
• C)benzoate ion
• D)benzoic acid
• E)This is a buffer solution: the pH does not change upon addition of acid or base.

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Definitions:

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