I have to complete an experiment for school where I have copper and zinc electrodes placed into an electrolyte of copper sulfate and I have measured the potential across it at varying temperatures. For example at 60°C (333K) I measured the potential to be 0.880 volts and at 75°C (348K) I measured the potential to be 0.780 volts.
Is there a way I can prove this result? I tried using the Nernst Equation, but my reaction quotient is equal to 1, which disproves my finding. I found out about activity coefficients, but I do not know how to apply it or the Nernst Equation to half cell potentials.
Any advice or help is greatly appreciated!