(Lần lượt là phương trình phân tử, ion đầy đủ, ion rút gọn).
1.
$2HCl+Na_2CO_3\to 2NaCl+CO_2+H_2O$
$2H^+ + 2Cl^- + 2Na^+ + CO_3^{2-}\to 2Na^+ + Cl^- + CO_2+H_2O$
$2H^+ +CO_3^{2-}\to CO_2+H_2O$
2.
$HCl+CH_3COONa\to CH_3COOH+NaCl$
$H^+ + Cl^-+ CH_3COO^- + Na^+\to CH_3COOH+Na^+ + Cl^-$
$H^+ CH_3COO^-\to CH_3COOH$
3.
$2HCl+Ba(OH)_2\to BaCl_2+2H_2O$
$2H^+ + 2Cl^- + Ba^{2+}+ 2OH^-\to Ba^{2+}+ 2Cl^- + 2H_2O$
$H^+ + OH^-\to H_2O$
4.
$Na_2SO_4+Ba(NO_3)_2\to BaSO_4+2NaNO_3$
$2Na^+ + SO_4^{2-}+Ba^{2+}+ 2NO_3^-\to BaSO_4+2Na^+ + 2NO_3^-$
$Ba^{2+}+ SO_4^{2-}\to BaSO_4$
5.
$Na_2SO_4+Ba(OH)_2\to BaSO_4+2NaOH$
$2Na^+ + SO_4^{2-}+Ba^{2+}+ 2OH^-\to 2Na^+ + 2OH^-+BaSO_4$
$Ba^{2+}+ SO_4^{2-}\to BaSO_4$
6.
$Na_2CO_3+Ba(NO_3)_2\to BaCO_3+2NaNO_3$
$2Na^+ + CO_3^{2-}+Ba^{2+}+ 2NO_3^-\to BaCO_3+2Na^+ + 2NO3^-$
$Ba^{2+}+ CO_3^{2-}\to BaCO_3$
7.
$Na_2CO_3+Ba(OH)_2\to 2NaOH+BaCO_3$
$2Na^+ + CO_3^{2-}+ Ba^{2+}+ 2OH^-\to BaCO_3+2Na^+ + 2OH^-$
$Ba^{2+}+ CO_3^{2-}\to BaCO_3$
