MCAT General Chemistry Question 145: Answer and Explanation

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Question: 145

10. What is the gram equivalent weight of phosphoric acid?

A. 24.5 g
B. 32.7 g
C. 49.0 g
D. 98.0 g

Correct Answer: B

Explanation:

Gram equivalent weight is the weight (in grams) that releases 1 acid or base equivalent from a compound. Because H₃PO₄ contains 3 protons, we find the gram equivalent weight by dividing the mass of one mole of the species by 3. The molar mass of phosphoric acid is so the gram equivalent weight is 32.7 g.

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