Question

balance redox reaction calculator An electrochemical cell has the following standard cell notation: Al(s) | Al3+(aq) || Mg2+(aq) | Mg(s) a. Write the balanced oxidation and reduction half-reactions, labeling the oxidation reaction and reduction reaction. (4 points) standard cell notation

Answer 1

Answer:

Al(s) ⇄ Al³⁺(aq) + 3e⁻  (oxidation)

Mg⁺²(aq) + 2e⁻ ⇄ Mg(s) (reduction)

Explanation:

In the cell notation, first is placed the anode and then the cathode, so Al(s) is in the anode, where an oxidation reaction is taking place, and Mg²⁺ is in the cathode, where a reduction reaction is taking place. The half-reactions are:

Al(s) ⇄ Al³⁺(aq) + 3e⁻  (oxidation)

Mg⁺²(aq) + 2e⁻ ⇄ Mg(s) (reduction)

For the global reaction, it'll be necessary that the number of electrons (e⁻) is equal in the half-reactions, so the first one is multiplied by 2 and the second by three and the global reaction is:

2Al(s) + 3Mg⁺²(aq) ⇄ 2Al³⁺(aq) + 3Mg(s)