Determination of K,TRIALVolume NaOH atpH at Midpoint ofTitrationMidpoint ofTitration1.3.223.Average KIdentity of Unknown Acid

Answered: Determination of K Volume NaOH at…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Determination of K,
TRIAL
Volume NaOH at
pH at Midpoint of
Titration
Midpoint of
Titration
1.
3.22
3.
Average K
Identity of Unknown Acid

Expert Solution

Step 1

In a weak acid-strong base titration curve, the concentration of acid at the midpoint is equal to the concentration of its conjugate base. Hence the pH = pKa. This point is known as the half-neutralization point.

Trial-1

pH at midpoint of titration = 3.01

Therefore pKa = 3.01

Trial-2

pH at midpoint of titration = 3.22

Therefore pKa = 3.22

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