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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb732abbc-b634-4376-a3f1-15affc6eeba5%2Ff0a86bd4-2acf-4fd8-9799-a137475fb069%2Fvtdwgqi.jpeg&w=3840&q=75)
Transcribed Image Text: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
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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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