Synthesis of sodium manganate

Preparation of sodium manganate decahydrate

Preparation of sodium manganate decahydrate

Preparation of sodium manganate decahydrate

Two grams of very finely powdered potassium permanganate are added to 50 ml of a 30% (by weight) solution of sodium hydroxide at 0° C. 3.5 g of finely divided sodium sulfite 7-hydrate (or 1.8g of the an hydrous salt) are stirred in and the mixture agitated at 0° C for 10 minutes. The purple liquid turns blue and the similarly colored product separates during this time. The crystals are suction-filtered and washed with 15 ml of 30% of ice-cold sodium hydroxide, then dried rapidly on a porous plate in vacuo over potassium or sodium hydroxide. Sodium manganate is unstable and it is best to store the material in a dry, well-sealed, non-vitreous vessel, out of contact with heat and moisture.

Inorganic laboratory preparations, by G. G. Schlessinger, 38, 1962

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