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) , K_a2 = 6.2 × 10^-8.

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

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