Iron & Ammonium Citrate
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SL. NO
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TESTS
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STANDARDS
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1
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Characters
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A
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Description |
Thin, transparent, dark red scales or granules or a brownish red powder; odourless; deliquescent in moist air and is affected by light.
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B
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Solubility |
Very soluble in water; practically insoluble in ethanol (95%).
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2
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Identification
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A
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Reaction of Ferric salts | |||
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i
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Reaction A
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An intense blue precipitate should be produced which should be insoluble in dilute hydrochloric acid.
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ii
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Reaction B
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The red colour should disappear.
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ii
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Reaction C
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A stable green colour should be formed.
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B
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Reaction of Citrates | |||
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i
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Reaction A
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A white precipitate should be formed which should be soluble in 6M acetic acid.
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ii
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Reaction B
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A violet colour should be produced which should change to violet-blue.
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3
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Arsenic
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Not more than 4 ppm.
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4
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Lead
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Not more than 30 ppm. | ||
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5
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Zinc
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Not more than 50 ppm.
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6
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Free Ferric Compounds
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No blue precipitate should be formed.
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7
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Chlorides
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Not more than 0.25%
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8
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Sulphate
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Not more than 0.3%
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9
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Assay
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Between 20.5% and 22.5% (of iron, Fe)
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