Explanation Determining the pH of a weak acid solution is more complicated because the concentration of H 3 O + is not equal to the concentration of the weak acid. Because weak acids only partially ionize in water, calculating the [H 3 O + ] requires solving an equilibrium problem. Given: Concentration of formic acid, [HCHO 2 ]=0.200M Calculation: Formic acid is a weak acid, hence it only dissociates partially. HCHO 2 (aq)+H 2 O(l) ⇌ H 3 O + (aq)+CHO 2 − (aq) K a We can summarize the initial conditions, the changes, and the equilibrium conditions in the following ICE table: [HCHO 2 ] [H 3 O + ] [CHO - 2 ] Initial 0.200 0.00 0.00 Change -x +x +x Equilibrium 0.200-x x x We can use the equilibrium expression to set up an equation in which x is the only variable: K a = [H 3 O + ][CHO 2 − ] [HCHO 2 ] = x 2 0 ...

1st Edition

ISBN: 9780321834683

Author: Nivaldo J. Tro

Publisher: PEARSON

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Chapter 17, Problem 66E

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To determine:[H₃O⁺] and pH of a 0.200 M solution of formic acid.

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Chapter 17, Problem 65E

Chapter 17, Problem 67E

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Chemistry: Structure and Properties

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