$2NaOH + CO_2 \to Na_2CO_3 +H_2O$
$FeCl_3 + 3NaOH \to Fe(OH)_3 + 3NaCl$
$NaOH + HCl \to NaCl + H_2O$
$2Al + 2NaOH + 2H_2O \to 2NaAlO_2 + 3H_2$
$Al(OH)_3 + NaOH \to NaAlO_2 + 2H_2O$
$MgCl_2 + 2NaOH \to Mg(OH)_2 + 2NaCl$
$2NaOH + Cl_2O_5 \to 2NaClO_3 + H_2O$
$NaOH + CuSO_4 \to Cu(OH)_2 + Na_2SO_4$
$Zn + 2NaOH \to Na_2ZnO_2 + H_2$
$NaOH + HNO_3 \to NaNO_3 + H_2O$