Quote: Originally posted by Romix | It went back to jelly state, over night standing at room temp, I added more water, and heated it, dissolved all.
Unsolube at room temp.
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Quote: | If it's Al(OH)3.nH2O where chlorine anions gone?
And aluminium hydroxides and oxide are white powder. |
The Cl anions stay in solution.
What you observed could be hydrolysis:
AlCl3 + H2O < === > Al(OH)Cl2 + HCl and:
Al(OH)Cl2 + H2O < === > Al(OH)2Cl + HCl
These aluminohydroxichlorides are jelly like and may re-enter solution in some circumstances.
To avoid aluminohydroxichlorides forming, always keep pH really low.
Freshly prepared aluminium hydroxides is a voluminous, watery jelly, not a powder at all.
[Edited on 19-10-2015 by blogfast25] |