Question

When copper rod is dipped in $CuS{O}_4$ solution, the potential developed at the interface is called as __________ .

• A. electrode potential
• B. standard potential
• C. cell potential
• D. none of the above

Answer 1

The correct option is A electrode potential

Copper rod is dipped into $CuS{O}_4$ solution. Since, copper is a less active metal, $C{u}^{+2}$ ions present in the solution accept an electron from the metal rod and copper is deposited on the metal rod. Hence, copper rod becomes positively charged, and attracts the negatively charged $S{O}_4^{-2}$ ions from the solution. Thus, an electrical double layer is created and a potential at the interface of copper rod and $CuS{O}_4$ solution. The electrical potential developed at the interface of the metal and its solution due to Helmholtz electrical double layer is called single electrode potential. Thus, when copper rod is dipped in $CuS{O}_4$ solution, the potential developed at the interface is called electrode potential.