Redox reactions can be written as two half-reactions, focusing on the gain or loss of electrons by one of the chemical substances. one half-reaction shows the oxidation while the other shows the reduction. when the two half-reactions are combined, the overall reaction is obtained.

the half-reactions can aid in the balancing of redox equations because the number of each element must be balanced as well as the number of electrons gained and lost.

what is the coefficient for oh⁻ when sn²⁺ + io₃⁻ → sn₄⁺ + i⁻ is balanced in base?

a. 4
b. 3
c. 6
d. 2