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Appearance
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A fine,white,bulky,amorphous powder free from grittiness
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Solubility
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Practically insoluble in water; in ethanol (95%)and in ether
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Identification 'A' & 'B'
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Passes IP test
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Appearance of solution
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Solution A should not more intensely coloured than reference solution YS6
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Acidity or alkalinity
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Not more than 0.3 ml of 0.1M HCl or 0.1 ml of 0.1M NaOH should be required to change the colour of the solution
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Alkali & alkaline earth metals
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The residue weights not more than 20 mg
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Arsenic (As)
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NMT 2 ppm
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Chlorides
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NMT 250 ppm
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Sulphates
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NMT 0.6%
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Assay (as Zn; complexometric)
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10.0-12.0%
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