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+H2O?C5H5NH++OH?
The pKb of pyridine is 8.75. What is the pH of a 0.140M 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 ionizes in water:
C6H5COOH?C6H5COO?+H+
The pKa of this reaction is 4.2. In a 0.72M solution of benzoic acid, what percentage of the molecules are ionized?
Express your answer to two significant figures and include the appropriate units.
percent ionized=
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+H2O?C5H5NH++OH?
The pKb of pyridine is 8.75. What is the pH of a 0.140M 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 ionizes in water:
C6H5COOH?C6H5COO?+H+
The pKa of this reaction is 4.2. In a 0.72M solution of benzoic acid, what percentage of the molecules are ionized?
Express your answer to two significant figures and include the appropriate units.
percent ionized=
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