ACS Chemistry Practice Exam 2025 – The All-in-One Guide to Exam Success!

Question: 1 / 400

Which type of acid has two ionizable protons?

Monoprotic acid

Diprotic acid

A diprotic acid is characterized by having two ionizable protons, meaning it can donate two protons (H⁺) when it reacts with a base or in solution. Typical examples of diprotic acids include sulfuric acid (H₂SO₄) and carbonic acid (H₂CO₃), both of which can lose two protons in a stepwise manner.

In contrast, a monoprotic acid has only one ionizable proton, while a triprotic acid contains three ionizable protons. The classification of weak acid refers to the strength of the acid in terms of its ability to dissociate in solution, but it does not directly indicate the number of ionizable protons. Therefore, in the context of this question, the focus on the number of ionizable protons clearly identifies diprotic acid as the correct choice.

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Triprotic acid

Weak acid

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