Question

What is a self indicator?

Answer 1

Indicator

• A material that can be added to the reaction mixture to show the titration's equivalence point.
• pH is frequently measured with colored indicators.
• In a primary environment, these indications are a different color than in an acidic environment.
• Litmus is blue in a basic environment and red in an acidic environment.

Self Indicator

• The Self Indicator is a chemical compound that will show self-participation in the reaction.
• The self indicator indicates the titration or other reaction's endpoint.

Example of Self Indicator

• By obvious or indirect titration, potassium permanganate (${\mathrm{KMnO}}_4$) is a versatile and strong oxidant that can be used to detect a variety of chemicals.
• Potassium permanganate has the distinct advantage of being a self-indicator.
• Permanganate titration should be performed in a strong acid solution.
• When employed in redox titration, it is reduced to a brown-colored ${\mathrm{Mn}}^{2+}$ ion at the endpoint in acidic solutions, and the color change is plainly visible.
• Because the indicator's role is to identify endpoints, a new indication isn't needed during permanganate titration.
• The reaction can be shown as: ${\mathrm{KMnO}}_4\left(\mathrm{aq}\right)\left(\mathrm{violet}\right)\to {\mathrm{Mn}}^{2+}\left(\mathrm{s}\right)\left(\mathrm{colorless}\right)$