Question

cell reaction for galvanic cell Cu(s)/Cu2+(aq)//Hg2+(aq)/Hg(l)

Answer 1

Answer:

              Cell reaction for Galvanic Cell,

               Cu ∣ $Cu^2$ ║ $Ag^+$ ∣ Ag.

1) In the above cell reaction, Copper(Cu) acts as Anode and Silver(Ag) acts as cathode.

2) Copper (Cu) is more reactive than Silver(Ag).

3) Reaction at Anode is: Cu -> $Cu^{2+}$ + 2$e^-$

4) Redox reactions are reactions in which both oxidation and reduction takes place together. In a Galvanic cell oxidation occurs at anode and reduction occurs at cathode. Here Cu is an anode and Ag is a cathode. As in Oxidation, the electrons get released to form aqueous ions in the solution and hence reduces the mass of the electrode as the electrons are released from the electrode. Here,Cu electrode loses mass. Similarly,the released electrons are gained by silver ions i.e $Ag^+$ and the electrode mass of Ag gets increased.

Answer 2

Galvanic cell reaction

Explanation:

A Galvanic cell reaction is usually a redox reaction, meaning an oxidation-reduction reaction. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. In a Galvanic cell, oxidation reaction occurs at the anode and the reduction reaction occurs at cathode.

Let Cu be the anode and Ag be the cathode of the Galvanic cell. So oxidation occurs at the anode and electrons get released to form aqueous ions in the solution. This will reduce the mass of the electrode as the electrons are released from the copper electrode. Similarly, these released electrons will be gained at the silver cathode. So silver will gain electrons and hence increase in mass.

The question has an error. Mercury (Hg) is not the cathode. It is Silver (Ag)