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Description
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A white, crystalline or granular powder or flakes; hygroscopic
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Identification
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-
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Identification 'A'
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To 10% w/v solution add ferric chloirde test solution ; a buff coloured precipitate is fomred. Add dilute hydrochloric acid ; a white crystalline precipitate is produced
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Identification 'B'
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Gives the reactions of sodium salts and reactions (B) and (C) of benzoates
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Appearance of solution
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10.0% w/v solution in carbon dioxide free water is clear and not more intensely coloured than reference solution Y6
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Acidity or alkalinity
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NMT 0.2 ml of 0.1 M hydrochloric acid or 0.1 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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Chlorinated compounds
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The filtrate complies with the limit test for chlorides
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Loss on drying (at 105°C)
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NMT 2.0%
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Assay
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NLT 99.0% and NMT 100.5% of C7H5NaO2, calculated on the dried basis
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