The chemical Potassium Nitrate has a designated molecular formula of KNO3 and a molecular weight of 101.102 g/mol. Synonyms may include: AI3-51245, Caswell No. 697, CCRIS 3667, Collo-Bo, EINECS 231-818-8, EPA Pesticide Chemical Code 076103, HSDB 1227, Kalii nitras, Kaliumnitrat [German], Niter, Niter (VAN), Nitrate of potash (ChemID).