Which is a tribasic acid? A. Succinic acid B. Lactic acid C. Citric acid D. Valeric acid

The correct answer is $\boxed{\text{(C) citric acid}}$.

A tribasic acid is an acid that has three hydrogen atoms that can be ionized in water. Citric acid is a tricarboxylic acid, which means it has three carboxyl groups (-COOH). When citric acid is dissolved in water, the carboxyl groups can lose a hydrogen ion each, forming three citrate ions.

Succinic acid is a dicarboxylic acid, which means it has two carboxyl groups. When succinic acid is dissolved in water, the carboxyl groups can lose a hydrogen ion each, forming two succinate ions.

Lactic acid is a monocarboxylic

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