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Description
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White, granular crystals or a crystalline powder; hygroscopic
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Identification
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-
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Identification 'A'
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It gives the reaction of potassium salts
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Identification 'B'
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The solution gives reaction of citrates
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Appearance of solution
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10% solution in water is clear and colourless
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Acidity or alkalinity
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Not more than 0.2 ml of 0.1M hydrochloric acid or 0.1M sodium hydroxide is required to change the colour of the solution
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Arsenic
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NMT 2 ppm
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Heavy metals
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NMT 10 ppm
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Sodium
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NMT 0.3%
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Chlorides
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NMT 100 ppm
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Oxalate
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NMT 300 ppm (calculated as anhydrous oxalic acid)
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Sulphates
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NMT 150 ppm
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Readily carbonisable substance
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The solution is not more intensely coloured than reference solution YS2 or GYS2
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Water
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4.0 – 7.0%
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Assay
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NLT 99.0% and NMT 101.0% of C6H5K3O7, calculated on anhydrous basis
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