Posted by Lena on Wednesday, July 22, 2009 at 12:56am.
sorry about the re-post
it was an accident
Here is a very very good web site that talks about the CrO4^-2/Cr2O7^-2 equilibrium with H^+ and what happens with added H^+, then OH^-. In essence, BaCrO4 is insoluble so that yellow ppt is what you get when Ba(NO3)2 is added to CrO4^-2. BaCr2O7 is relatively soluble; therefore, it will not ppt unless there in huge amounts. After reading the material that talks about the equilibrium in broad terms, go back to the top and click on the highlighed area that is underlined. That takes you to another page that explains in detail how the equilibrium works.
http://www.digipac.ca/chemical/equilibrium/dichromate/dichromate3.htm
Thank You :D
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