Balance the equation in basic conditions. Phases are optional. equation: SO3^-2+Co(OH)2⟶Co+SO4^-2

Answer 1

Reduction half reaction:

Co²⁺ ==> Co ... balanced for Co

Co²⁺ + 2e- ==> Co ... balanced for mass and charge = balanced reduction reaction

Oxidation half reaction:

SO₃^2- + H₂O ==> SO₄^2- ... balanced for S and O

SO₃^2- + H₂O + 2OH- ==> SO₄^2- + 2H₂O ... balanced for S, O and H using OH^- as base

SO₃^2- + H₂O + 2OH^- ==> SO₄^2- + 2H₂O + 2e- ... balanced for mass and charge = balanced ox. reaction

Add the reduction and oxidation half reactions together and combine/cancel like terms to get:

Co²⁺ + SO₃^2- + 2OH^- ==> Co + SO₄^2- + H₂O ... balanced redox reaction

If you want to combine the Co2+ and 2OH-, you can rewrite this as

Co(OH)₂ + SO₃^2- ==> Co + SO₄^2- + H₂0