Answered: (c) What is the pKa of the acid? (only…

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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A 5.145 g sample of a solid, weak, monoprotic acid is used to make a 100.0 mL solution. 27.00 mL of the resulting acid solution is then titrated with 0.09636 M NaOH. The pH after the addition of 16.00 mL of the base is 5.75, and the endpoint is reached after the addition of 45.85 mL of the base.

(a) How many moles of acid were present in the 27.00 mL sample?
4.42e-3 mol

(b) What is the molar mass of the acid?
314 g/mol

(c) What is the pK_a of the acid?

(only confused on part c, answers for a and b are given)

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