Potentiometric and Colorimetric Titration

Initializing live version
Download to Desktop

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram Player or other Wolfram Language products.

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).

Feedback (field required)
Email (field required) Name
Occupation Organization
Note: Your message & contact information may be shared with the author of any specific Demonstration for which you give feedback.