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potassium phosphate

Any one of three orthophosphates of potassium.

The monobasic form, KH2PO4, consists of colorless, water-soluble crystals melting at 253_C; used in sonar transducers, optical modulation, medicine, baking powders, and nutrient solutions; also known as potassium acid phosphate, potassium dihydrogen phosphate (KDP), potassium diphosphate, potassium orthophosphate. The dibasic form, K2HOP4, consists of white, water-soluble crystals; used in medicine, fermentation, and nutrient solutions; also known as potassium hydrogen phosphate, potassium monophosphate. The tribasic form, K3PO4, is a water-soluble, hygroscopic white powder, melting at 1340_C; used to purify gasoline, to soften water, and to make liquid soaps and fertilizers; also known as neutral potassium phosphate, tripotassium orthophosphate.

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