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Appearance
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White or almost white, crystalline powder, hygroscopic.
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Assay
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98.5-101.5%
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Solubility
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Freely soluble in water, practically insoluble in ethanol (96 per cent).
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Identification (as per BP)
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Complies
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Appearance of solution
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10% solution in water is clear and colorless
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pH
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9.8-10.8
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Chloride (Cl)
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Max 0.005%
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Sulphate and selenate (as SO4)
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Max 0.03%
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Iron (Fe)
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Max 0.005%
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