Electrochemistry

Mercury cell is a type of electrochemical cell known as a primary cell, where the electrochemical reaction occurs only once, and it cannot be recharged. The cell uses the reaction between mercury(II) oxide ( ) and zinc ( ) to generate electrical energy. Mercury cells are more advantageous than dry cells because they have a long shelf life, deliver stable voltage, and operate efficiently in a wide range of temperatures. Additionally, they are less prone to leakage compared to dry cells.

To calculate the EMF of an electrochemical cell, we use the formula: Since the redox reaction is spontaneous, the species with higher reduction potential will act as cathode. From the given values: - - Thus: - Cu /Cu will be the cathode - Sn /Sn will be the anode So, Therefore, the spontaneous cell potential is:

(a)(ii) Use Faraday’s second law: Given:

Given: (i) Conductivity: (ii) Resistivity: (iii) Molar Conductivity: