Question

(1) Under acidic conditions, MnO₂ becomes Mn²⁺. Write the balanced half-reaction for this transformation. (Omit states-of-matter from your answer.)

(2) Balance the following half-reaction under basic conditions. NO₃⁻ → NH₃

(3) Balance the following redox (oxidation-reduction) reaction under basic conditions. (Include states-of-matter under the given conditions in your answer. Use the lowest possible whole number coefficients.

CrO₄²⁻(aq) + S₂O₃²⁻(aq) → Cr³⁺(aq) + SO₄²⁻(aq)

Answer 1

1)

2)

Balancing O,

Balancing H,

For reactions in a basic medium, add one OH- ion to each side for every H+ ion present in the equation.

Balancing Charge,

3)

Balancing O,

Balancing H,

For reactions in a basic medium, add one OH- ion to each side for every H+ ion present in the equation.

Balancing Charge,