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Experiment 17: Potentiometric Titration

1 Experiment 17: Potentiometric Titration Objective: In this Experiment , you will use a pH meter to follow the course of acid-base titrations . From the resulting Titration curves , you will determine the concentrations of the acidic solutions as well as the acid-ionization constant of a weak acid. Introduction You have performed acid-base titrations in the past to determine the concentration of an acidic or basic solution using a colored indicator. However, there are times when an appropriate indicator does not exist, or where the color of the solution would obscure any color change associated with the endpoint. In such cases, a pH meter can be used to monitor the acidity of the solution throughout the Titration . Recall the definition of pH: pH = log[H3O+] The pH Meter (see Tro, p.)

Experiment 17: Potentiometric Titration Objective: In this experiment, you will use a pH meter to follow the course of acid-base titrations. From the resulting titration curves, you will determine the concentrations of the acidic solutions as well as the acid-ionization constant of a weak acid.

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