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Description
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A white, crystalline powder or small, opaque, monoclinic crystals. It gradually forms sodium carbonate on heating in the dry state or in solution
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Solubility
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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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On heating, a gas should evolve and the solution should become red
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Identification 'B'
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It should give reaction A of bicarbonates
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Identification 'C'
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Solution A should give the reactions of sodium salts
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Appearance of solution
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Solution A should be Clear & colorless
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Arsenic
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NMT 2 ppm
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Calcium
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A 2.0 per cent w/v solution, when boiled for 5 minutes should be clear
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Iron
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NMT 20 ppm
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Carbonate
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The pH of freshly prepared solution S is not greater than 8.6
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Chlorides
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NMT 200 ppm
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Sulphates
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NMT 150 ppm
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Assay
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99.0 – 101.0%
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