What ia the effect of change of ph on dicromates ion intext:zigya?
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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
chromate (yellow)-------->dichromate(orange)
2CrO42- + 2H+ → Cr2O72-+ H2O
Effect of increase in pH
dichromate(orange)--------------->chromate (yellow)
Cr2O72-+ 2OH- → 2CrO42- + H2O
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