Synthesis of Fremy’s salt

Dissolve 10 g of┬ápotassium hydroxylamine disulfonate in hot 25-30 mL of water with stirring. Dissolve 2 g of potassium permanganate in about 15 mL of water. Combine both solutions, magnetically stir rapidly for 5 minutes and filter. Collect the liquid, flush with inert gas and cover then chill the solution down to freezer temperature for 24h. Filter, dry and use the fremy’s salt immediately. Fremy’s salt will decompose fast in the presence of oxygen.

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Potassium permanganate solution

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Potassium hydroxylamine disulfonate solution

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Both solutions combined

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Filtering, manganese dioxide precipitated.

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Graduated beaker was flushed with nitrogen gas and put in a freezer

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Fremy’s salt crystallizing out from the solution in a freezer

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Fremy’s salt

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