What is the effect of increasing pH on a solution of potassium dichromate????
plz help me in dis!!
The dichromate ion(Cr2O72-) exists in equilibrium with chromate(CrO42-) ion at pH 4, However by changing the pH, they can be inter converted.
Effect of decrease in pH
2CrO42- + 2H+ → Cr2O72-+ H2O
Effect of increase in pH
Cr2O72-+ 2OH- → 2CrO42- + H2O
The structures of chromate ion, CrO42- and the dichromate ion,Cr2O72- are shown below...
The chromate ion is tetrahedral whereas the dichromate ion consists of two tetrahedral sharing one corner with Cr–O–Cr bond angle of 126°.
Hope this answers your query.!