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Description
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Colourless crystals or a white, crystalline powder
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Solubility
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Freely soluble in alcohol, in chloroform, and in ether; slightly soluble in water
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Identification
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It should give the reactions of chlorides and reaction of ammonia salts
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Appearance of solution
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Solution A should be clear and colourless
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pH
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4.5 – 6.0
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Arsenic
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NMT 4 ppm
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Iron
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NMT 20 ppm
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Calcium
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NMT 200 ppm
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Sulphates
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NMT 150 ppm
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Thiocyanate
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No red colour is produced
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Sulphated ash
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NMT 0.1%
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Loss on drying (at 105°C)
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NMT 1.0%
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Assay (on dried basis)
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99.0 – 100.5%
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