part A . Pyridine is a weak base that is used in the manufacture of pesticides a

Question

part A. Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins. It is also a component of cigarette smoke. Pyridine ionizes in water as follows: C5H5N+H2OC5H5NH++OH

The pKb of pyridine is 8.75. What is the pH of a 0.480 M solution of pyridine? Express the pH numerically to two decimal places.

part B. Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid dissociates in water: C6H5COOHC6H5COO+H+

The pKa of this reaction is 4.2. In a 0.65 M solution of benzoic acid, what percentage of the molecules are ionized?

Explanation / Answer

part A . Pyridine is a weak base that is used in the manufacture of pesticides a

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