Sodium permanganate

Sodium Permanganate

Sodium permanganate

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Sodium permanganate is the inorganic compound with the formula NaMnO<sub>4</sub>. It is closely related to the more commonly encountered potassium permanganate, but it is generally less desirable, because it is more expensive, absorbs water from the atmosphere, and has a low melting point. Being about 15 times more soluble than KMnO<sub>4</sub>, sodium permanganate finds some applications where very high concentrations of MnO<sub>4</sub><sup>-</sup> are sought.

Preparation and properties

Sodium permanganate cannot be prepared analogously to the route to KMnO<sub>4</sub> because the required intermediate manganate salt, Na<sub>2</sub>MnO<sub>4</sub>, does not form. Thus less direct routes are used including conversion from KMnO<sub>4</sub>.

Sodium permanganate behaves similarly to potassium permanganate. It dissolves readily in water to give deep purple solutions, evaporation of which gives prismatic purple-black glistening crystals of the monohydrate NaMnO<sub>4</sub>┬ĚH<sub>2</sub>O. The potassium salt does not form a hydrate. Because of its hygroscopic nature, it is less useful in analytical chemistry than its potassium counterpart.

It can be prepared by the reaction of manganese dioxide with...
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