... Formula: C6H20 N2O12P4 Ethylene Diamine Tetra (Methylene Phosphonic Acid) EDTMPA CAS No 1429-50-1 Dequest: 2040Molecular Formula: C6H20 ... N2O12P4 Molecular weight: 436.13 Structural Formula: Properties:EDTMPA is Pale yellow solution at room temperature, with melting ... 5% at room temperature, easy dissolved in ammonia. EDTMPA has strong metal ion chelating capacity, whose chelating constant ...