Bạn tham khảo:
$a/$
$Ag^{+} +Cl^{-} \to AgCl$
$\to AgNO_3+HCl \to AgCl+HNO_3$
$b/$
$Ba^{2+} +SO_4^{2-} \to BaSO_4$
$\to BaCl_2+H_2SO_4 \to BaSO_4+2HCl$
$c/$
$H^{+} +OH^{-} \to H_2O$
$\to NaOH+HCl \to NaCl+H_2O$
$d/$
$HCO_3^{-} +H^{+} \to CO_2+H_2O$
$\to Ca(HCO_3)_2+2HCl \to CaCl_2+2CO_2+H_2O$