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Sample Exercise 17.1 Calculating the pH When a Common Ion ...

Copyright 2009 by Pearson Education, Saddle River, New Jersey 07458 All rights : The Central Science, Eleventh EditionBy Theodore E. Brown, H. Eugene LeMay, Bruce E. Bursten, and Catherine J. MurphyWith contributions from Patrick WoodwardSample Exercise Calculating the pH When a Common Ion is InvolvedWhat is the pH of a solution made by adding mol of acetic acid and mol of sodium acetate to enough water to make L of solution?SolutionAnalyze: We are asked to determine the pH of a solution of a weak electrolyte (CH3 COOH) and a strong electrolyte (CH3 COONa) that share a Common ion, CH3 COO.

constant expression: (The dissociation constant for. CH 3 COOH at 25 ºC is from Appendix D; addition of CH 3 COONa does not. change the value of this constant.) Substituting the equilibrium -constant. concentrations from our table into. the equilibrium expression gives

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