Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Concept explainers

Acid Base Titration
An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.
Question
For a solution of 0.020 M lactic acid, HC₃H₅O₂ (Kₐ = 8.4 × 10⁻⁴), calculate: (a) [H⁺] [Information box] ___________ M (b) pH [Information box] ___________ (c) percent ionization [Information box] ___________ %
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Transcribed Image Text:For a solution of 0.020 M lactic acid, HC₃H₅O₂ (Kₐ = 8.4 × 10⁻⁴), calculate: (a) [H⁺] [Information box] ___________ M (b) pH [Information box] ___________ (c) percent ionization [Information box] ___________ %
Expert Solution
Check Mark
Step 1

Given that: Concentration of lactic acid = 0.020 M and Ka = 8.4×10-4

To find:

  1. Concentration of H+ ions
  2. pH of the solution
  3. Percent ionization
Step 2

Lactic acid is a weak acid. The dissociation of this weak acid in water is as given by the reaction shown below.

HC3H5O3aq→C3H5O3−aq+H+aq

Step 3

Let x amount of lactic acid dissociate at equilibrium, the ICE table for the reaction is given by,

HC3H5O3→C3H5O3−+H+I0.02000C−x+x+xE0.020−xxx

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