MCAT Organic Chemistry Question 146: Answer and Explanation

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Question: 146

11. At physiological pH, which two forms of phosphoric acid have the highest concentrations?

• A. H₃PO₄ and H₂PO₄^-
• B. H₂PO₄^- and HPO₄^2-
• C. HPO₄^2- and PO₄^3-
• D. PO₄^3- and H₃PO₄

Correct Answer: B

Explanation:

The pK_a2 of phosphoric acid is close to physiological pH; therefore, [H₂PO₄^-]≈[HPO₄^2-] at this pH.

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