SODIUM MONOCHLORO ACETATE (SMCA) (C2H2ClNaO2) is the sodium salt of Monochloroacetic Acid (MCA). Sodium Monochloro Acetate (SMCA) is obtaining from neutralization of Monochloroacetic Acid (MCA) with Sodium Carbonate (Soda Ash). Another method of manufacturing Sodium Monochloro Acetate (SMCA) is spraying molten Monochloroacetic Acid (MCA) together with 50 % Caustic Soda solution into a spray dryer. SYNONYMS Sodium Chloroacetate, Chloroacetic acid sodium salt, Monochloroacetic acid sodium salt, Monochloroethanoic acid sodium salt, Chloroethanoic acid sodium salt, SMCA, SMA, Monoxone. IUPAC NAME: Sodium 2-chloroacetate. CAS REGISTRY NUMBER: 3926-62-3 EC NUMBER: 223-498-3 UN NUMBER: 2659 CHEMICAL FORMULA: C2H2ClNaO2