Chemical formula: Na2 H2 P2 O7 Other Names: Disodium pyrophosphate, Disodium diphosphate, Disodium dihydrogen pyrophosphate, Acid sodium pyrophosphate Disodium Sodium acid pyrophosphate is an inorganic compound consisting of sodium cations and pyrophosphate anions. It is a food additive whose role is to improve the quality and stability of food products.