Why don't we use indicators in redox-titration?

Answer 1

Because the end point can easily be observed.

Example: consider the titration between potassium manganate (IV) which is purple and ammonium iron (II) sulfate - colourless.

At the end point the colourless standard solution will turn pale pink when the correct volume of deep purple titre is added. No indicator is required. Also this is not necessarily an acid base rxn

Answer 2

Redox reactions involve the transfer of electrons, and indicators are typically used in acid-base titrations where the pH changes. In redox titrations, the endpoint is determined by detecting a change in voltage or current, rather than a color change. Using indicators in redox titrations can interfere with the accuracy of the results.