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Appearance
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White crystals or crystalline flakes (turns pink on exposure to air and light)
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Assay
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99.5% - 100.5%
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Solubility
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Soluble in water, very soluble in ethanol (96 per cent), in glycerol and in methylene chloride
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Identification 'A'
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A blue colour developes and becomes progressively more intense.
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Identification 'B'
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To 1 mL of solution S add 100 mL of water R and 0.1 mL of ferric chloride solution R1. A violet color is produced which disappears on addition of 5 mL of 2-propanol R
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Identification 'C'
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To 1 ml of solution S add 10 ml of water and 1 mL of bromine water R. A white precipitated is formed.
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Melting point
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39 - 42°C
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Appearance of solution
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Solution S is clear and not more intensely coloured than reference solution B6.
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Acidity
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To 2 mL of solution S add 0.05 mL of methyl orange solution R. The solution is yellow.
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Iron (Fe)
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Max 0.0001%
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Lead (Pb)
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Max 0.001%
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Chloride (Cl)
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Max 0.005%
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Freezing point
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Min 39.5°C
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Residue on evaporation
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Max 0.05%
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Water (by KF)
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Max 0.2%
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