Sodium Thiosulphate Pentahydrate AR/ACS 500Gram

PRODUCT CODE 646905
SYNONYMS --
C.I. NO.
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CASR NO. (10102-17-7)
ATOMIC OR MOLECULAR FORMULA Na2S2O3.5H2O
ATOMIC OR MOLECULAR WEIGHT 248.17
PROPERTIES Cooling taste and bitter aftertaste, deliquescent in moist
air .

PARAMETER LIMIT
Description Colourless crystals or crystalline powder, free from white powder.
Solubility 10% solution in water is clear and colourless.
Identification Passes test
Minimum Assay (Iodometric) 99-101%
pH (10% soln.in water) 6.0 – 8.4

MAXIMUM LIMIT OF IMPURITIES
Insoluble matter 0.005%
Water (vacuum at 40-45°for 16 hrs) 32 – 37%
Nitrogen compounds (N) 0.002%
Sulphate & Sulphite (SO4) 0.1%
Arsenic (As) 0.0002%
Copper (Cu) 0.0005%
Sulphide (S) Passes test