What is the effect of increasing pH on a solution of potassium dichromate????

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The dichromate ion(Cr₂O₇^2-) exists in equilibrium with chromate(CrO₄^2-) ion at pH 4, However by changing the pH, they can be inter converted.

Effect of decrease in pH

chromate (yellow)-------->dichromate(orange)

2CrO4^2- + 2H⁺ → Cr₂O₇^2-+ H₂O

Effect of increase in pH

dichromate(orange)--------------->chromate (yellow)

Cr₂O₇^2-+ 2OH^- → 2CrO₄^2- + H₂O

The structures of chromate ion, CrO₄^2- and the dichromate ion,Cr₂O₇^2- 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°.

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