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A 425 mg sample of a weak diprotic acid is dissolved in enough water to make...

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Chemistry

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

Answer & Explanation Solved by verified expert
4.3 Ratings (813 Votes)
weight of the weak acid 425 mg 0425 gv 275 mlKg 8E5pH 308ksp 13E6CaOH2 Ca2 2OHs 2sksp s 2s2 4s3s 6875E3 Ms c for a    See Answer
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