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Description
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A soft, white or faintly yellowish white amorphous powder, free from grittiness. It gradually absorbs carbon dioxide from air
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Solubility
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2. Solubility Practically insoluble in water and in ethanol (95%).It dissolves in dilute minerals acids
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Identification
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-
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Identification 'A'
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The yellow colour should disappeared on cooling
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Identification 'B'
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The solution should give the reaction of zinc salts
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Alkalinity
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Not more than 0.3 ml of 0.1 M hydrochloric acid should be required to discharge the colour
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Carbonate and substances insoluble in acids
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Solution should not be more opalescent than opalescence standard OS2, and colourless
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Arsenic
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NMT 5 ppm
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Iron
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NMT 400 ppm
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Lead
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The solution should remain clear
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Loss on ignition
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NMT 1.0%
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Assay (on ignited basis)
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99.0 – 100.5%
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