Chemistry containing hydrogen and potassium in combination, as hydropotassic sulphate, a double sulphate of H and K, K2SO4.H2SO4, commonly called bisulphate of potash.
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1876 J. HarleyRoyle's Man. Materia Med. (ed. 6) 316Hydropotassic Oxalate is the form in which oxalic acid exists in the acid species of Oxalis, Rumex, Rheum, Geranium [etc.].