Sodium Thiosulphate
Molecular Formula:Na2S2O3.5H2O Molecular Weight:248.19 g/mol CAS NO.:10102-17-7
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Specification…BP
Appearance
Transparent, colorless crystals, efflorescent in dry air
Solubility
Very soluble in water, practically insoluble in ethanol (96%). It is soluble in its water of crystallization at about 490C
Appearance of solution
The solution is clear and colorless
pH
6.0 to 8.4
Sulphates and Sulphites
Maximum 0.2%
Sulphides
Passes test
Heavy metals
Maximum 10ppm
Assay
Not less than 99% and not more than 101%