A 425 mg sample of a weak diprotic acid is dissolved in enoughwater to make 275.0 ml of solution. The pH of this solution is3.08. A saturated solution of calcium hydroxide (Ksp= 1.3 x 10^-6) is prepared by adding excesscalcium hydroxide to water and then removing the undissolved solidby filtration. Enough of the calcium hydroxide solution is added tothe solution of the acid to reach the second equivalence point. ThepH at the second equivalence is 11.7. The first dissociationconstant for the acid is 8.0 x 10^-5. Assume that the volumes ofsolutions are additive and that the first K for the acid is atleast 1000 times greater than the second K.
a- Calculate the molar mass ofthe acid
b- Calculate the seconddissociation constant for the acid
