Mn is in the +7 state in KMnO4, which is a potent oxidizing agent. While it will operate as an oxidizing agent in neutral and basic media, there is a change of 5 electrons in acidic media.
The electronegative properties of the elements increase with the oxidation states of the atoms. Permanganate is a good oxidizing agent because of this.
While gently swirling the solution in the flask, the heated solution is titrated against a solution of potassium permanganate. Oxalic acid initially causes KMnO4 to lose its purple color. The conclusion is revealed by the appearance of permanent pink color.
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