1.
The equilibrium constant for the disproportionation reaction
2Cu+(aq)Cu(s)+Cu2+(aq)2\text{Cu}^+ (aq) \longrightarrow \text{Cu}(s) + \text{Cu}^{2+} (aq)

at 25^\circC
(ECu+/Cu=0.52E^\circ_{\text{Cu}^+/\text{Cu}} = 0.52 V, ECu2+/Cu=0.16E^\circ_{\text{Cu}^{2+}/\text{Cu}} = 0.16 V) is: