MCAT General Chemistry Question 288: Answer and Explanation
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Question: 288
1. Carbonic acid is best described as:
- A. amphoteric.
- B. polyprotic.
- C. a strong acid.
- D. the conjugate acid for CO2.
Correct Answer: B
Explanation:
B Even though the bicarbonate ion is amphoteric and can donate and accept a proton, carbonic acid cannot (eliminate choice A). Choice C is eliminated because carbonic acid is not one of the six strong acids you should know for the MCAT (HI, HBr, HCl, HClO4, H2SO4, HNO3). Choice D is false because carbon dioxide and carbonic acid cannot be a conjugate acid-base pair since they differ by more than one H+. Choice B is correct because carbonic acid has the ability to donate two protons, making it polyprotic.