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Sodium Acid Pyrophosphate, also called Disodium Pyrophosphate or SAPP (Na2H2P2O7), is a white, water-soluble solid that serves as a buffering and chelating agent, with many applications in the food industry. When crystallized from water, it forms a hexahydrate, but it dehydrates above room temperature. Pyrophosphate is a polyvalent anion with a high affinity for polyvalent cations, e.g., Ca2+. Disodium pyrophosphate (E450 (a)) is a popular leavening agent found in baking powders. It combines with sodium bicarbonate to release carbon dioxide.