P-Toluene Sulphonic Acid (PTSA)-MonohydrateProductPTSA (Monohydrate)CAS #6192-52-5Empirical FormulaC7H8O3S.H2OMolecular Weight190.2Physical AppearanceA White to Off-White MaterialAssay (By Chemical)Min. 97.0%Moisture Content (KFR)NMT 13.0%Free AcidMax. 1.0%