Variation of oxidizing power of manganate (VII) ions with pH.

Variation of oxidizing power of manganate (VII) ions with pH.

The oxidizing power of potassium permanganate depends on the pH as shown below:

(a) Acidic solution

MnO₄^– (aq) + 8H⁺ (aq) + 5e →Mn²⁺ (aq) + 4H₂O (l)

(b) Neutral or alkaline solutions,

The manganate (VII) is reduced to manganese (IV) oxide.

MnO₄^– (aq) + 2H₂O (l) + 3e → MnO₂ (aq) + 4OH- (l)

(c)Strongly alkaline solution

Manganate (VII) is reduced to green manganate (VI).

MnO₄^– (aq) + e-  → MnO₄^2- (aq)

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