A 225-mg sample of a diprotic acid is dissolved in enough

Chapter 15, Problem 112

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A 225-mg sample of a diprotic acid is dissolved in enough water to make 250. mL of solution. The pH of this solution is 2.06. A 6.9 103 M solution of calcium hydroxide is prepared. Enough of the calcium hydroxide solution is added to the solution of the acid to reach the second equivalence point. The pH at the second equivalence point (as determined by a pH meter) is 7.96. The first dissociation constant for the acid is 5.90 1Ka1 2 102 . Assume that the volumes of the solutions are additive, that all solutions are at 25 C, and that is at least 1000 times greate than . a. Calculate the molar mass of the acid. b. Calculate the second dissociation constant for the acid .

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