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Appearance
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Large, colourless crystals or coarse crystalline powder
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Assay (iodometric)
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99-100.5%
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Identity
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Passes test
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Appearance of solution
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Dissolve 10.0 g in 50 ml of distilled water R, add 1 ml of 0.1 M sodium hydroxide and dilute to 100 ml with the same solvent. Clear & colourless
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pH (10% solution in water)
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6.0 - 8.4
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Chloride (Cl)
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Max 0.05%
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Sulphate and Sulphite (as SO4)
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Max 0.2%
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Sulphide (S)
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Passes test
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Heavy metal (as Pb)
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Max 0.001%
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Calcium (Ca)
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Passes test
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Water
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32.0 - 37.0%
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