Potentiometric titration (with the Cobra3 Basic-Unit)

Principle

In a potentiometric titration, the equivalence point is detected by monitoring the electromotive force (e.m.f.) of an electrochemical cell formed by an indicator electrode coupled with a convenient reference electrode. The potential of the indicator electrode, and hence the e.m.f. of the cell, is a measure of the activity (approximately the concentration) of the ionic species in the electrolyte solution.

Tasks

1. Perform a potentiometric titration on the iron(II)/cerium(IV) redox system with a 0.1 molar iron(II) sulphate solution to determine the factor for cerium(lV) sulphate solution.
2. Determine the concentration of an unknown iron(ll) solution.
3. Discuss the general form of the titration curve in terms of the Nerst equation.

What you can learn about

• Potentiometric titration
• Redox reaction
• Nernst equation
• Quantitative analysis

Literature for this article als follows

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