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Hydrate of Potassa (Hydrated or caustic potassa)

Hydrated or caustic potassa, when perfectly pure, is white, solid, very soluble in water and in a!cohol, very deliquescent, and corrosive. To obtain it, evaporate solution of potassa rapidly in an iron vessel over the fire until ebull:tion ceases and the potassa melts. Pour this into suitable moulds, and, when cold, put it into stoppered bottles.