The presence of excess MnO₄⁻ ion acts as an indicator in the redox titration because they turn the solution pink at the end point.
What is Redox Titration ?
Redox Titration is a laboratory method of determining the concentration of a given analyte by causing a redox reaction between the titrant and the analyte.
The presence of excess MnO₄⁻ ion acts as an indicator in the redox titration because they turn the solution pink at the end point.
Because MnO₄⁻ is dark violet in colour & presence of it in little excess will give the solution pink colour at the end point.
Mn²⁺ and Fe²⁺ will not give such colour so cannot be used as indicator.
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