Potassium manganate

Potassium Manganate

Potassium manganate

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Description:
Potassium manganate is the inorganic compound with the formula K<sub>2</sub>MnO<sub>4</sub>. This green-colored salt is an intermediate in the industrial synthesis of potassium permanganate (KMnO<sub>4</sub>), a common chemical. Occasionally, potassium manganate and potassium permanganate are confused, but they are different compounds with distinctly different properties.

Structure

K<sub>2</sub>MnO<sub>4</sub> is a salt, consisting of K<sup>+</sup> cations and MnO<sub>4</sub><sup>2−</sup> anions. X-ray crystallography shows that the anion is tetrahedral, with Mn-O distances of 1.66 Å, ca. 0.03 Å longer than the Mn-O distances in KMnO<sub>4</sub>. It is isostructural with potassium sulfate.

Synthesis

The industrial route entails treatment of MnO<sub>2</sub> with air:
2 MnO<sub>2</sub> + 4 KOH + O<sub>2</sub> → 2 K<sub>2</sub>MnO<sub>4</sub> + 2 H<sub>2</sub>O
The transformation gives a green-colored melt. In fact, one can test an unknown substance for the presence of manganese by heating the sample in strong KOH in air. The production of a green coloration indicates the presence of Mn. This green color results from an intense absorption at 610&nbsp;nm.

In laboratory, K<sub>2</sub>MnO<sub>4</sub> can be synthesized by heating a...
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