Sodium manganate

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Description:
Sodium manganate is the inorganic compound with the formula Na<sub>2</sub>MnO<sub>4</sub>. This is a deep green solid is rarely encountered analogue of the related salt K<sub>2</sub>MnO<sub>4</sub>. Sodium manganate is rarely encountered because it cannot be readily prepared from by the oxidation of manganese dioxide and sodium hydroxide. Instead this oxidation stops at the level of Na<sub>3</sub>MnO<sub>4</sub>, and this Mn(V) salt is unstable in solution. Sodium manganate can be produced by reduction of sodium permanganate under basic conditions.
4 NaOH + 4NaMnO<sub>4</sub> → 4 Na<sub>2</sub>MnO<sub>4</sub> + 2 H<sub>2</sub>O + O<sub>2</sub>
Because Na<sub>3</sub>MnO<sub>4</sub> is difficult to prepare, sodium permanganate is more expensive than potassium permanganate.

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Sodium manganate
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