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Description
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Colourless crystals or a white powder
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Solubility
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Very soluble in water, freely soluble in glycerine; insoluble in ethanol (95 per cent)
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Identification
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The solution should give the reactions of potassium salts, and of iodides
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Appearance of solution
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Solution should be clear & colorless
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Alkalinity
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No colour should be produced on addition of a drop of phenolphthalein solution
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Arsenic
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NMT 2 ppm
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Iron
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NMT 20 ppm
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Barium
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No turbidity should be developed within one minute
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Cyanide
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No blue colour should be produced
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Iodate
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No blue colour should be produced within 2 minutes
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Sulphates
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NMT 150 ppm
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Thiosulphate
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A blue colour should be produced
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Loss on drying
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NMT 1.0%
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Assay (on dried basis)
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99.0% to 100.5%
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