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:
1. The pKb of pyridine is 8.75. What is the pH of a 0.490M solution of pyridine?
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 ionizes in water:
2. The pKa of this reaction is 4.2. In a 0.69M solution of benzoic acid, what percentage of the molecules are ionized?