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Potassium Thiodimolybdate, K2Mo2S7

Potassium Thiodimolybdate, K2Mo2S7, is obtained as a dark grey substance on addition of a deficiency of mineral acid (preferably acetic acid) to an aqueous solution of the normal thiomolybdate and evaporation of the brown liquid.

The compound K6Mo2S9 results from the passage of hydrogen sulphide through a 5 per cent, solution of normal potassium molybdate containing a sufficient excess of potash. The aqueous solution is orange-yellow in colour.
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