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+H2O⇌C5H5NH++OH−
The pKb of pyridine is 8.75. What is the pH of a 0.185 M solution of pyridine?
Express the pH numerically to two decimal places.
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pH= ____ |
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:
C6H5COOH⇌C6H5COO−+H+
The pKa of this reaction is 4.2. In a 0.64 M solution of benzoic acid, what percentage of the molecules are ionized?
Express the percentage numerically using two significant figures.
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