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

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Determination of K Volume NaOH at Midpoint of Titration TRIAL pH at Midpoint of Titration K, 1 3.01 3.22

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter26: Molecular Absorption Spectrometry

Section: Chapter Questions

Problem 26.25QAP

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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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