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Description
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White, granular crystals or a white, crystalline powder
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Identification
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Passes test
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Appearance of solution
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Solution A is clear and colourless
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Acidity or alkalinity
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Not more than 0.5 ml of 0.05 M sulphuric acid or of 0.1 M sodium hydroxide is required
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Arsenic
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NMT 2 ppm
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Heavy metals
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NMT 10 ppm
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Chlorides
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NMT 100 ppm
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Oxalate
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NMT 300 ppm
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Sulphates
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NMT 150 ppm
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Tartrates
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Passes test
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Readily carbonisable substance
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Passes test
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Water
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11.0 to 13.0 %
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Assay (on anhydrous basis)
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99.0 – 101.0%
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