When the following oxidation-reduction occurs, what is the balanced reduction half-reaction after the electrons in both half reactions are balanced? al (s) + cu2+ (aq) → al3+ (aq) + cu (s) view available hint(s) when the following oxidation-reduction occurs, what is the balanced reduction half-reaction after the electrons in both half reactions are balanced? al (s) + cu2+ (aq) → al3+ (aq) + cu (s) 2al (s) → 2al3+ (aq) + 6e− al (s) → al3+ (aq) + 3e– cu2+ (aq) + 2e− → cu (s) 3cu2+ (aq) + 6e− → 3cu (s)

Answer :  The balanced reduction half-reaction is:

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

The given balanced redox reaction is :

The half oxidation-reduction reactions are:

Oxidation reaction :

Reduction reaction :

In order to balance the electrons, we multiply the oxidation reaction by 2 and reduction reaction by 3 and then added both equation, we get the balanced redox reaction.

Oxidation reaction :

Reduction reaction :

The balanced redox reaction will be:

Thus, the balanced reduction half-reaction is: