Write the net ionic equation for the reaction of dichromate ions with hydroxyl
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Answer. Balance Cr. Cr2O2-7⇌2CrO2-4. Balance O. Add 1H2O to the left hand side. Cr2O2-7+1H2O⇌2CrO2-4. Balance H. Add 2H+ to the right hand side. Cr2O2-7+1H2O⇌2CrO2-4+2H+ Convert to basic solution. Cr2O2-7+1H2O ⇌2CrO2-4+2H+ 2H+ +2OH-⇌2 H2O−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Cr2O2-7+2OH-⇌2CrO2-4+H2O.
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Answer. Balance Cr. Cr2O2-7⇌2CrO2-4. Balance O. Add 1H2O to the left hand side. Cr2O2-7+1H2O⇌2CrO2-4. Balance H. Add 2H+ to the right hand side. Cr2O2-7+1H2O⇌2CrO2-4+2H+ Convert to basic solution. Cr2O2-7+1H2O ⇌2CrO2-4+2H+ 2H+ +2OH-⇌2 H2O−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Cr2O2-7+2OH-⇌2CrO2-4+H2O.
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