sodium phosphate

sodium phosphate

noun Chemistry.
1.
Also called monobasic sodium phosphate. a white, crystalline, slightly hygroscopic, water-soluble powder, NaH 2 PO 4 , used chiefly in dyeing and in electroplating.
2.
Also called dibasic sodium phosphate, disodium phosphate. a water-soluble compound that in its anhydrous form, Na 2 HPO 4 , occurring as a white, crystalline, hygroscopic powder, is used chiefly in the manufacture of ceramic glazes, enamels, baking powder, and cheeses, and that in its hydrated form, Na 2 HPO 4 ⋅xH 2 O, occurring as clear colorless crystals, is used chiefly in the manufacture of dyes, fertilizers, detergents, and pharmaceuticals.
3.
Also called tribasic sodium phosphate, trisodium phosphate, TSP. a colorless water-soluble compound, Na 3 PO 4 ⋅12H 2 O, occurring as crystals: used chiefly in the manufacture of water-softening agents, detergents, paper, and textiles.

Origin:
1870–75

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World English Dictionary
sodium phosphate
 
n
any sodium salt of any phosphoric acid, esp one of three salts of orthophosphoric acid having formulas NaH2PO4 (monosodium dihydrogen orthophosphate), Na2HPO4 (disodium monohydrogen orthophosphate), and Na3PO4 (trisodium orthophosphate)

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