Sodium acid pyrophosphate is a white, odorless powder that is highly soluble in water. It serves as a leavening agent, acidity regulator, and emulsifying agent, making it a valuable ingredient in numerous food products. It’s often found in baked goods, processed meats, and dairy products. The chemical formula for SAPP is Na2H2P2O7, and it is recognized by its E number, E450.