Water Nuggets Practice Exam 2025 - Free Practice Questions and Study Guide

Question: 1 / 400

At its endpoint, what color does potassium permanganate oxidant turn?

Red

Pink

Reddish-brown

Potassium permanganate is a strong oxidizing agent and is known for its deep purple color in solution. When it reacts with a reducing agent, the purple color diminishes as the permanganate ions (MnO4-) are reduced. At the endpoint of a titration involving potassium permanganate, the solution typically takes on a reddish-brown hue. This color change indicates that all the reducing agent has reacted, and the excess permanganate ions are present, which reflects the characteristic color associated with manganese in a lower oxidation state. This interplay of colors highlights the chemical changes occurring during the redox reaction, where the endpoint signifies that the reaction is complete, hence the reddish-brown color is the appropriate answer.

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