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Question 8.1: Diprotic Acids . Show how the amphiprotic ion hydrogen sulfa...

Diprotic Acids . Show how the amphiprotic ion hydrogen sulfate, HSO_{4}^{-}, can react as both an acid and a base.

Strategy : For a molecule to act as both an acid and a base, it must be able to both give up a hydrogen ion and accept a hydrogen ion. Therefore we write two equations, one donating a hydrogen ion and the other accepting one.

 

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Hydrogen sulfate reacts as an acid in the equation shown below:

HSO_{4}^{-} + H_{2} O \xrightleftharpoons[]{} H_{3} O^{+} + SO_{4} ^{2-}

It can react as a base in the equation shown below:

HSO_{4}^{-} +H_{3} O^{+} \xrightleftharpoons[]{} H_{2} O + H_{2}SO_{4}

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