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Description
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A soft, white or faintly yellowish white amorphous powder, free from grittiness
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Identification
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-
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Identification 'A'
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It becomes yellow when strongly heated; the yellow colour disappears on cooling
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Identification 'B'
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The solution gives the reactions of zinc salts
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Alkalinity
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NMT 0.3 ml of 0.1 M hydrochloric acid is required to discharge the colour
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Carbonate and substances insoluble in acids
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No effervescence is produced and the solution is not 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 remains clear
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Loss on ignition (at 500°C)
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NMT 1.0%
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Assay
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NLT 99.0% and NMT 100.5% of ZnO, calculated in ignited basis
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