Explain why `Cu^+` ion is not stable in aqueous solution?

Explanation

The oxidation.state of a metal in a solvent depends upon the piature of the solvent. The metal in a particular oxidation state may undergo oxida-:
tioa or reduction in the solvent under appropriate conditions. For example, Cu" is unstable in water as it undergoes oxidation to .(Cu)^(2+). and reduction to Cu, i.c.i it undergoes disproportionation. 2 (Cu)^(*)(aq) rarr (Cu)^(2+)(aq)+(Cu)(s)
The .(E)^(s). value for this reaction is favourable.