posted by Lena .
If I were to use dichromate and add HCL and Ba(NO3)2 and NaOH , what should form?
Im thinking the Ba(NO3)2 would still form a precipitate but im not too sure about everything else
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.
Thank You :D