0.250 M of NaOH is used to carry out the titration of a weak diprotuce solid. It is used until the second equivalence point has been surpassed. The equivalence points are easily seen at 12mL and 24 ml, but the mass of the unknown solid was never documented. Using pKa values, the identity of the unknown is presumed to be ascorbic acid. How many grams of ascorbic acid was there to begin with? (For reference, ascorbic acid's molar mass is 176.12 g mol, the pKa1 is 4.10, and the pKa2 is 11.79)

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 93QRT: When 40.00 mL of a weak monoprotic acid solution is titrated with 0.100-M NaOH, the equivalence...
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0.250 M of NaOH is used to carry out the titration of a weak diprotuce solid. It is used until the second equivalence point has been surpassed. The equivalence points are easily seen at 12mL and 24 ml, but the mass of the unknown solid was never documented. Using pKa values, the identity of the unknown is presumed to be ascorbic acid. How many grams of ascorbic acid was there to begin with?

(For reference, ascorbic acid's molar mass is 176.12 g mol, the pKa1 is 4.10, and the pKa2 is 11.79)

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