Posted by Chem Student on Monday, March 5, 2012 at 8:04pm.
There is an equilibrium represented as follows:
2CrO4^2- + 2H^+ ==> Cr2O7^2- + H2O
So in acid solution the Cr2O7^2- predominates and in neutral or basic solution the CrO4^2- is the main ion.
Barium ion forms a ppt with CrO4^2- but not with Cr2O7^2-. So to get BaCrO4 you are depending upon the equilibrium conditions to help you get enough CrO4^2- to exceed the Ksp of BaCrO4.
Thank you! :D
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