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Appearance
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White or almost white, crystalline powder, colourless crystals or granules, efflorescent
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Assay (by NaOH titration)
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99.5 -100.5% (on anhydrous substance)
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Solubility
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Very soluble in water, freely soluble in ethanol (96 per cent)
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Identifications
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Passes BP test
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Appearance of solution
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Passes BP test
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Residue on ignition (at 800°C)
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Max 0.02%
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Insoluble matter (13.2% in water)
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Max 0.005%
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Chloride (Cl)
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Max 0.001%
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Oxalate (as C2H2O4) - as per ACS
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Passes test
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Oxalic acid
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Max 0.036%
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Sulphate (SO4)
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Max 0.002%
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Water (H2O)
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7.5 - 9.0%
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Substance carbonizable by hot H2SO4
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Passes test
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Lead (Pb)
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Max 0.0002%
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Iron (Fe)
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Max 0.0003%
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Phosphate (PO4)
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Max 0.001%
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