Standard potentials are measured against the standard hydrogen electrode (S. H.E.). Because it is not always convenient to use a S. H.E., often other reference electrodes are used. The saturated calomel electrode (S. C.E.) is one commonly used reference electrode, with a reduction potential of 0.242 V versus the S. H.E. Using a table of standard reductions, determine what the potential of each reduction below would be versus the S. C.E? Cu2+(aq) + 2e^- ⇌ Cu(s)
Al3+(aq) + 3e^- ⇌ Al(s)