We have to determine if the given compound is soluble or insoluble in water.
The given compound is copper (II) hydroxide, [tex]Cu(OH)_{2}[/tex]. According to the solubility rules the hydroxides of all metal ions are insoluble except that of ammonium and the alkali metal ions. So copper(II) hydroxide will be insoluble in water. In aqueous solution, copper (II) hydroxide would exist as a sparingly soluble compound in which the undissociated compound remains in equilibrium with the ions [tex]Cu^{2+}[/tex]and [tex]OH^{-}[/tex]. The equilibrium would remain mostly towards undissociated form.
[tex]Cu(OH)_{2}(s)<==>Cu^{2+}(aq)+2OH^{-}(aq)[/tex]
Therefore, [tex]Cu(OH)_{2}[/tex]is insoluble in water.
