Question about chromate-dichromate equilibrium?


by HelloMotto
Tags: chromatedichromate, equilibrium
HelloMotto
HelloMotto is offline
#1
May6-09, 08:43 PM
P: 74
Ok so when i add HCl to a chromate solution, it turns orange (dichromate) because the equilibrium shifts to the right, inorder to reduce the excess hydrogen ions from the HCl Acid.

But when I add HCl to dichromate, the color changes the same. How do i explain this phenomenon.

and is this the right equation?


2[CrO4]-2 + [H]+ <---> [Cr2O7]-2 + H2O
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Borek
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#2
May7-09, 02:54 AM
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P: 22,705
Equation is OK.

Take a look at it - what would you expect if you dissolve dichromate in pure water?


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