Question

Why ${\mathrm{KMnO}}_4$ is a self-indicator?

Answer 1

Potassium Permanganate(${\mathrm{KMnO}}_4$) :

1. Potassium permanganate has the chemical formula ${\mathrm{KMnO}}_4$.
2. It is a flexible and potent oxidant that may be used to classify a variety of substances by direct or indirect titration.

Self-indicator:

1. Potassium Permanganate has a unique utility in that it works as a self-indicator.
2. Titration of permanganate must be done in a strong acid solution.
3. When employed in redox titration, it is reduced to a brown-colored ${\mathrm{Mn}}^{2+}$ ion (in acidic solutions) near the endpoint, and the color transformation may be seen fast.
4. A separate indication for permanganate titration is not required because the indicator's function is to identify endpoints.

Hence, ${\mathrm{KMnO}}_4$ is a self-indicator.