CAS number: 7784-30-7
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Dried Aluminium Phosphate BP Ph Eur
Hydrated Aluminium Phosphate, Ph Eur
CAS No: 7784-30-7 (anhydrous)
Action and use: Antacid.
Content: 94.0 per cent to 102.0 per cent of AlPO4 ignited substance).
Appearance: White or almost white powder.
Solubility: Very slightly soluble in water, practically insoluble in alcohol. It dissolves in dilute solutions of mineral acids and alkali hydroxides.
A. Solution S (see Tests) gives reaction (b) of phosphates.
B. Solution S gives the reaction of aluminium.
Solution S: Dissolve 2.00 g in dilute hydrochloric acid R and dilute to 100 ml with the same acid.
Appearance of solution: Solution S is clear and colourless.
pH: 5.5 to 7.2
Shake 4.0 g with carbon dioxide-free water and dilute to 100 ml with the same solvent.
Chlorides: Maximum 1.3 per cent.
Soluble phosphates: Maximum 1.0 per cent, calculated as PO4.
Sulphates: Maximum 0.6 per cent.
Arsenic: Maximum 1 ppm.
Heavy metals: Maximum 20 ppm.
Loss on ignition: 10.0 per cent to 20.0 per cent, determined on 1.000 g at 800 ± 50C.
Neutralising capacity: Add 0.50 g to 30 ml of 0.1 M hydrochloric acid previously heated to 37C and maintain at this temperature for 15 min while stirring. The pH of the mixture after 15 min at 37C is 2.0 to 2.5.
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