释义 |
sodium pyrophosphate noun : any of four sodium salts of pyrophosphoric acid: as a. : a crystalline acid salt Na2H2P2O7 used chiefly as a leavening agent, in acid cleaning compositions, and in electroplating; disodium dihydrogen pyrophosphate — called also sodium acid pyrophosphate b. : the crystalline normal salt Na4P2O7 used chiefly as a builder in soaps and detergents and as a deflocculant (as in treating drilling muds for oil wells) — called also tetrasodium pyrophosphate |