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 NaOH to this buffer solution causes the pH to increase slightly.The pH does not increase drastically because the NaOH reacts with the ________ present in the buffer solution.The of benzoic acid is 6.3 × 10^-5. A) O C)benzoate D)benzoic acid E)This is a buffer solution: the pH does not change upon addition of acid or base.

Question

Quizplus · Accepted Answer

The pH of the solution only slightly increases upon the addition of NaOH because the added base reacts with the weak acid in the buffer solution to form its conjugate base. In this case, the weak acid is benzoic acid (C6H5COOH), and the conjugate base is sodium benzoate (C6H5COO- Na+). Therefore, the NaOH reacts with benzoic acid (D) present in the buffer solution. Since the solution is a buffer solution, the pH does not change drastically upon the addition of a small amount of base or acid.

A Solution Is Prepared by Dissolving 0