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Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins....

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Chemistry

Pyridine is a weak base that is used in the manufacture ofpesticides and plastic resins. It is also a component of cigarettesmoke. Pyridine ionizes in water as follows:

C5H5N+H2O⇌C5H5NH++OH−

a) The pKb of pyridine is 8.75. What is the pH of a0.440 M 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 aciddissociates in water:

C6H5COOH⇌C6H5COO−+H+

b) The pKa of this reaction is 4.2. In a 0.63M solution of benzoic acid, what percentage of themolecules are ionized?

Answer & Explanation Solved by verified expert
4.2 Ratings (849 Votes)
a C5H5NH2OC5H5NHOH 044M 0 0 044x x x pKb875 pKb log Kb Kb 178 x 109 Kb OH C5H5NH C5H5N 178x109 x2 044x x    See Answer
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