Chemical Forums

Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: DOracle on February 12, 2008, 10:05:33 AM

Title: Why is Al2O3 soluble?
Post by: DOracle on February 12, 2008, 10:05:33 AM
Why is Al2O3 soluble in sodium hydroxide? What´s the minimal required concentration for?

I have no idea. THx.
Title: Re: Why is Al2O3 soluble?
Post by: Arkcon on February 12, 2008, 10:26:57 AM
Al2O3 reacts with sodium hydroxide, to produce aluminum hydroxide, which is also insoluble.  But, in an excess of hydroxide, aluminum from a soluble complex.  "Minimum required concentration for" is a little hard to answer, any concentration (more than a trace, likely) so long as there is a "excess" which is a little hard to pin down.