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why aluminium chloride solution is pale yellow.

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Borek:
Getting a stoichiometric amount of amorphous solid that is difficult to wash/filter out/dry would be a miracle.

If there is more than expected it is either contaminated by some byproduct of the reaction or still wet.

Aniket:
Dear Sir,

One more confusion why aluminium hydroxide react with HCL to give yellow colour solution.

its due to amorphous nature of aluminium carbonate or bicarbonate?

AWK:
Something went wrong, but this does not give rise to questioning the stoichiometry of the reaction. This has to be analyzed on-site.
As for the yellow color after adding HCl to Al(OH)3 - some reagents must be contaminated. Iron chloride (both II and III) in excess of HCl is practically colorless.

chenbeier:

--- Quote from: Aniket on June 12, 2020, 05:16:30 AM ---Dear Sir,

Drying method is spray drying.

Product pass in British Pharmacopoeial Requirements.No chance of any impurity or other salt.

--- End quote ---

Additionally did ypu check the equipment?  If the preperation done in glasfree vessels maybe some metal part is attacked by the acid.

Aniket:
Dear Sir,

we final concluded that during reaction amorphous solid formation occur that why increase yield.

but cant understand for yellow colour liquid produce during reaction of aluminium hydroxide with HCL.

aluminium hydroxide contain less than 100 ppm iron and HCL AR grade contain less than 10 ppm iron.

sir yellow colour is only due to iron impurity?

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