Potentiometric and Colorimetric Titration

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Titrations can be based on redox reactions. The objective here is to do a simple titration and use the titration curve to deduce the concentration and standard potentials of the redox couples—a potentiometric titration. The reaction considered is .

Contributed by: Quang-Dao Trinh (March 2011)
Open content licensed under CC BY-NC-SA



The following shows how to determine equivalence by colorimetry using a color indicator.

With the volume of (in mL) added to the solution of at the unknown initial solution , we have the following results:

Here (in mL) is the volume of the solution of .

(in mol/L) is the unknown concentration of that we need to find.

(in mol/L) is the known concentration of .

(in mL) is the volume of used to reach equilibrium with .

When , the concentration of the couple is negligible, so the potential measured is that of the couple /:


When , the couple determines the measured potential:


The change of the potential near the equivalence point can be used to determine the equilibrium volume . Then the unknown concentration can be calculated using (mol/L).

This Demonstration was based on the electrochemistry course (Cours LC102) for first-year students at University Pierre Marie Curie (Paris).

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