Answer
See answer below.
Work Step by Step
a) Reaction: $2\ CH_3CO_2H(aq)+Sr(OH)_2(aq)\rightarrow Sr(CH_3CO_2)_2(aq)+2\ H_2O(l)$
Net ionic:
$CH_3CO_2H(aq)+OH^-(aq)\rightarrow CH_3CO_2^-(aq)+H_2O(l)$
b) Reaction: $Zn(s)+2\ HCl(aq)\rightarrow ZnCl_2(aq)+H_2(g)$
Net ionic:
$Zn(s)+2\ H_3O^+(aq)\rightarrow Zn^{2+}(aq)+H_2(g)+2\ H_2O(l)$
