Question

Calculate the standard potential of a Daniell cell if the concentration of copper ions and zinc ions in their respective half-cells is 1.0 M and the temperature of the cell is 25°C. The standard reduction potentials of copper and zinc electrodes are +0.34 V and -0.76 V respectively.

Answer 1

To calculate the standard potential of a Daniell cell, we need to consider the standard reduction potentials of both copper and zinc electrodes. The standard potential of a cell  Ecell  is the difference between the standard reduction potentials of the two half-cells.Ecell = Ecathode - EanodeIn a Daniell cell, the copper electrode acts as the cathode, and the zinc electrode acts as the anode. Therefore, we can use the given standard reduction potentials to calculate the standard potential of the cell:Ecell =  +0.34 V  -  -0.76 V Ecell = 0.34 V + 0.76 VEcell = 1.10 VSince the concentrations of copper and zinc ions are both 1.0 M, which are the standard conditions, the standard potential of the Daniell cell remains unchanged. Therefore, the standard potential of the Daniell cell at 25C with 1.0 M concentrations of copper and zinc ions is 1.10 V.