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Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is...

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Chemistry

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 inwater:

C6H5COOH⇌C6H5COO−+H+

The pKa of this reaction is 4.2. In a 0.57 Msolution of benzoic acid, what percentage of the molecules areionized?

Express your answer to two significant figures and include theappropriate units.

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