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Appearance
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A white to yellowish-white, fibrous powder
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Solubility
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Soluble in alkaline solutions; insoluble but swells in water; very slightly soluble in ethanol 95(%)or practically insoluble in organic solvents
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Identification as per IP
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Passes test A, B and C
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pH (3% solution in water)
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1.5 - 3.5
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Acid value (mg KOH/gm)
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Min 230.0
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Arsenic (As)
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Max 0.0005%
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Microbial contamination
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1 gm is free from Escherichia.coli and 10 g is free from salmonellae
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Total ash
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Max 4.0%
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Loss on drying (at 105°C; 4 hrs)
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Max 15.0%
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Assay (as carboxylic acid groups (COOH); on dried basis)
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19.0 - 25.0%
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