Answer
See answer below.
Work Step by Step
a) $Pb(NO_3)_2(aq)+2\ KOH(aq)\rightarrow Pb(OH)_2(s)+2\ KNO_3(aq)$
$Pb^{2+}(aq)+2\ OH^-(aq)\rightarrow Pb(OH)_2(s)$
b) $Cu(NO_3)_2(aq)+Na_2CO_3(aq)\rightarrow CuCO_3(s)+2\ NaNO_3(aq)$
$Cu^{2+}(aq)+CO_3^{2-}(aq)\rightarrow CuCO_3(s)$
