Complete and balance the following half-reaction in basic solution

Question

SO3^2-(aq) -> SO4^2-(aq)

Answer 1

SO₃^2-(aq) ==> SO₄^2-(aq) ... unbalanced

SO₃^2-(aq) + H₂O ==> SO₄^2-(aq) ... balanced for O

SO₃^2-(aq) + H₂O + 2OH^- ==> SO₄^2-(aq) + 2H₂O ... balanced for O and H using base OH-

SO₃^2-(aq) + H₂O + 2OH^- ==> SO₄^2-(aq) + 2H₂O + 2e- ... balanced for O, H and charge = balanced equation