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A Solution Is Prepared by Dissolving 20

Question 48

Multiple Choice

A solution is prepared by dissolving 20.0 g of K2HPO4 and 25.0 g of KH2PO4 in enough water to produce 1.0 L of solution. What is the pH of this buffer? For phosphoric acid (H3PO4) , Ka2 = 6.2 × 10-8.


A) 7.70
B) 7.42
C) 7.21
D) 7.00
E) 6.72

Correct Answer:

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