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Description
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A fine, heavy, white powder, free from gritty particles; odourless.
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Identification
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-
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Identification 'A'
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The solution gives the reactions of sulphates
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Identification 'B'
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A white precipitate is formed which is insoluble in dilute sodium hydroxide solution
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Acidity or alkalinity
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Not more than 0.5 ml of 0.01 M hydrochloric acid or of 0.01 M sodium hydroxide is required to change the colour of the solution
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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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Loss on ignition (at 600°C)
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NMT 2.5%
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Sulphide (S)
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Passes test
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Acid soluble substances
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NMT 0.3%
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Soluble barium salts
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No turbidity is produced within 30 minutes
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