Sodium Metabisulphite Purified 500G

PRODUCT CODE 030180 SYNONYMS (Sodium disulphite),(Sodium pyrosulphite) C.I. NO. — CASR NO. (7681 -57-4) Na2S2O5 ATOMIC OR MOLECULAR FORMULA Na2S2O5 ATOMIC OR MOLECULAR WEIGHT 190.11 PROPERTIES Moisture sensitive, PARAMETER LIMIT Description Fine white or almost white crystalline powder. Solubility 10% solution in water is clear and colourless. Identification Passes test. Minimum Assay (Iodometric) 95.0% pH (of 5% solution in water) 3.5 – 5.0 MAXIMUM LIMIT OF IMPURITIES Chloride (Cl) 0.01% Iron (Fe) 0.002% Heavy metals (as Pb) 0.001% Selenium (Se) 0.003% Sodium sulphite 0.75% Sodium sulphate 1.0% Thiosulphate 0.1%