How many grams of Ascorbic acid did you start with?

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 32QRT: The titration curves for two acids with the same base are shown on this graph. (a) Which is the...
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You carry out the titration of a week diprotic solid with .25 M NaOH until surpassing the second equivalence point.  The equivalence points are easy to see at 12 mL and 24 mL. You realize you forgot to write down the mass of your unknown and you do not want to start over.  Using the pKa values, you decide the identity of your unknown is Ascorbic acid(molar mass: 176.12 g/mol; pKa1: 4.1; pKa2: 11.79).  How many grams of Ascorbic acid did you start with? 

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