If the ?a of a monoprotic weak acid is 7.8×10^−6, what is the pH of a 0.12 M solution of this acid

Chemistry: Matter and Change
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ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
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Chapter18: Acids And Bases
Section18.2: Strengths Of Acids And Bases
Problem 18SSC
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If the ?a of a monoprotic weak acid is 7.8×10^−6, what is the pH of a 0.12 M solution of this acid?

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