Homework Help: Chemistry

Posted by Alan on Monday, March 22, 2010 at 5:56pm.

Why is heating required for this formation:
6NaOH (aq) + Al2(SO4)3 (aq) Би 2Al(OH)3 (s) + 3Na2SO4 (aq)?

Wouldn't freezing favour the formation of Al(OH)3 since freezing lower the KSP and more Al(OH)3 would precipitate?

Chemistry - DrBob222, Monday, March 22, 2010 at 6:05pm
It isn't. NaOH + Al2(SO4)3 forms Al(OH)3 easily. Heating will delay the pptn of Al(OH)3 since it is more soluble at elevated temperatures.

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