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What is the Ka of a weak acid (HA) if the initial concentration of weak acid is 0.75 M and the pH is 4.79? Group of answer choices 4.0 x 10-11 4.0 x 10-6 6.9 x 10-4 3.5 x 10-10 5.5 x 10-5

Introductory Chemistry: A Foundation

8th Edition

ISBN:9781285199030

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter16: Acids And Bases

Section: Chapter Questions

Problem 42QAP

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Question

What is the K_a of a weak acid (HA) if the initial concentration of weak acid is 0.75 M and the pH is 4.79?

Group of answer choices

4.0 x 10^-11

4.0 x 10^-6

6.9 x 10^-4

3.5 x 10^-10

5.5 x 10^-5

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