10182

# Potentiometric and Colorimetric Titration

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 .

### DETAILS

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).

### PERMANENT CITATION

 Share: Embed Interactive Demonstration New! Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details » Download Demonstration as CDF » Download Author Code »(preview ») Files require Wolfram CDF Player or Mathematica.

#### Related Topics

 RELATED RESOURCES
 The #1 tool for creating Demonstrations and anything technical. Explore anything with the first computational knowledge engine. The web's most extensive mathematics resource. An app for every course—right in the palm of your hand. Read our views on math,science, and technology. The format that makes Demonstrations (and any information) easy to share and interact with. Programs & resources for educators, schools & students. Join the initiative for modernizing math education. Walk through homework problems one step at a time, with hints to help along the way. Unlimited random practice problems and answers with built-in Step-by-step solutions. Practice online or make a printable study sheet. Knowledge-based programming for everyone.