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April 21, 2014

Homework Help: chemistry

Posted by cat on Sunday, March 4, 2012 at 8:09pm.

a 205 mg sample of diprotic acid is dissolved in enough water to make 250 ml of solution. The pH of this solution is 2.15. A saturated solution of calcium hyrdoxide (Ksp=1.3*10^-6) is prepared by adding excess calcium hydroxide to water and then removing the undissovled solid by filtration. Enough of the calucium hydroxide solution is added to the solution of the acid to reach the second equivalence point. The pH at the second equivalence is 9.40. The first dissociation constant for the acid is 1.7*10^-2. Assume that the volumes of solutions are additive and that the first K for the acid is at least 1000 times greater than the second K.
Calculate the molar mass of the acid
Calculate the second dissociation constant for the acid.

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