MCAT General Chemistry Question 285: Answer and Explanation

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Question: 285

4. Which of the following will form a buffer when combined with CaCO₃(aq)?

A. C₂H₄O₂
B. K₂CO₃
C. NaHCO₃
D. CO₂

Correct Answer: C

Explanation:

C A buffer must contain a conjugate acid-base pair. CO₃^2- is a basic ion so adding the conjugate acid, HCO₃^-, would be required to form a buffer solution. NaHCO₃^- will most readily supply this.

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