What is the standard electrode potential of the half-reaction:
\[
\text{Cu}^{2+} + 2e^- \rightarrow \text{Cu} \, (\text{solid})?
\]
Given that the standard electrode potential for the half-reaction:
\[
\text{Ag}^+ + e^- \rightarrow \text{Ag} \, (\text{solid}) \quad \text{is} \, +0.80 \, \text{V}.
\]
Also, the cell potential for the following reaction is:
\[
\text{Cu}^{2+} + 2\text{Ag} \rightarrow \text{Cu} + 2\text{Ag}^+
\]
is \( 0.46 \, \text{V} \).