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For H3PO4, a Tripotic Acid, Ka1 = 7

Question 95

Multiple Choice

For H3PO4, a tripotic acid, Ka1 = 7.1 × 10-3, Ka2 = 6.3 × 10-8, and Ka3 = 4.5 × 10-13. What is the pH of a solution that contains 0.400 moles of K2HPO4 and 0.300 moles of NaH2PO4 per liter ofsolution?Hint: treat this as a buffer and use the Ka that matches the given solutions.


A) 7.08
B) 7.20
C) 7.33
D) 10.20
E) 12.22

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