Substances that do not dissolve in water: The strengths of ionic bonding is so great that ion dipole forces that form are not enough to break it.
$Cr_{(aq)}^{3+} + 3OH_{(aq)}^{-} \rightarrow Cr(OH)_{3(s)}$
$Cu_{(aq)}^{2+} + 2OH_{(aq)}^{-} \rightarrow Cu(OH)_{2(s)}$
