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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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Very soluble in boiling water, freely soluble in water, practically insoluble in ethanol (95%)
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Identification
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-
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Identification 'A'
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It should give the reactions of sulphates
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Identification 'B'
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It should give reaction (A) of magnesium salts
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Appearance of solution
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Solution should be clear and colorless
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Acidity or alkalinity
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Not more than 0.2 ml of either 0.01M hydrochloric acid or 0.01 M sodium hydroxide should require to change the colour of the 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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Chlorides
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NMT 300 ppm
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Loss on drying
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48.0 to 52.0%
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Assay (on ignited basis)
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99.0% to 100.5%
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