Following reactions occur at cathode during the electrolysis of aqueous silver
chloride solution.
Ag (aq.) + e- Ag(s) E
0
= +0.80V
H
+
(aq.) + e-
H2(g) E
0
= 0.00V
Answers
Explanation:
The relationship between the standard free energy change and emf of a cell reaction is given by:
ΔG
∘
=−nFE
∘
Thus, more positive the standard reduction potential of a reaction, the more negative is the standard free energy change associated with the process and, consequentely, the higher is the feasibility of the reaction .
Since, E
∘
Ag
+
/Ag has a greater positive value than E
∘
H
+
/H the reaction which is feasible at the cathode is given by
Ag
+
(aq)
+
e
−
→Ag(s).
(b) The limiting molar conductivity of an electrolyte is defined as its molar conductivity when the concentration of the electrolyte in the solution approaches zero.
The conductivity of an electrolyte solution is the conductance of ions present in a unit volume of the solution. The number of ions (responsible for carrying current) decrease when the solution is diluted or the concentration of an electrolyte solution decrease with the decrease in concentration.