MCAT General Chemistry Question 233: Answer and Explanation

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Question: 233

2. All of the following are amphoteric EXCEPT:

A. HCO₃^-
B. H₂PO₄^-
C. SO₄^2-
D. HOOCCOO^-

Correct Answer: C

Explanation:

C An amphoteric substance is one that can act as both an acid and a base. This definition fits choices A, B, and D because they can all donate or accept a proton. Choice C has no protons for donation and cannot be acidic.

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