Question

To a Daniel cell, if $CuS{O}_4$ is added to the right hand side half cell, then the cell $EMF$:

• A. increases
• B. decreases
• C. does not change
• D. first increases and then decreses

Answer 1

The correct option is A increases

The reduction potential of cathode is directly proportional to the concentration of the electrolyte. When copper sulfate is added to the solution present in the cathode compartment, the concentration of the solution increases. This increases the reduction potential of cathode. Hence, the $EMF$ of the cell increases as $CuS{O}_4$ is added. $E_{cell}=E_{cathode}-E_{anode}$.

Hence, option $A$ is correct.