Answer to Question #284507 in General Chemistry for ababa zeleke

Question

1.    Balance each of the following equations according to the half-reaction method:

a) Br₂(l) + SO₂(g) ⟶ Br⁻(aq) + SO₄²⁻(aq)                               (in acid)

b) Cl₂(g) + OH−(aq) ⟶ Cl⁻(aq) + ClO₃⁻(aq)                            (in base)

 

Answer 1

a) Br₂(l) + 2e^- =  2Br⁻(aq) 

 SO₂(g) + 2H₂O (l) =  SO₄²⁻(aq) + 4H⁺ (aq) +2e^-

Total: Br₂(l) + SO₂(g) + 2H₂O (l) =  2Br⁻(aq) + SO₄²⁻(aq) + 4H⁺ (aq)

b) Cl₂(g) + 2e^- =  2Cl⁻(aq) 

 Cl₂(g) + 12OH⁻(aq) = 2ClO₃⁻(aq) + 6H₂O (l) + 10e^-

Total:  3Cl₂(g) + 6OH⁻(aq) = 5Cl⁻(aq) + ClO₃⁻(aq) + 3H₂O (l)