Đáp án:
Câu 2:
$a. 2HNO_3+CaCO_3\to Ca(NO_3)_2+CO_2+H_2O\\2H^++CaCO_3\to Ca^{2+}CO_2+H_2O$
$b. 3KOH+FeCl_3\to Fe(OH)_3↓+3KCl\\3OH^-+Fe^{3+}\to Fe(OH)_3↓$
$c. H_2SO_4+2NaOH\to Na_2SO_4+2H_2O\\H^++OH^-\to H_2O$
$d. Ca(NO_3)_2+Na_2CO_3\to CaCO_3↓+2NaNO_3\\Ca^{2+}+CO^{2-}_3\to CaCO_3$
$e. NaOH+Al(OH)_3\to NaAlO_2+2H_2O\\OH^-+Al(OH)_3\to AlO_2^-+2H_2O$
$f. Al_2(SO_4)_3+6NaOH\to 3Na_2SO_4+2Al(OH)_3↓\\Al^{3+}+3OH^-\to Al(OH)_3$
$g. 2NaOH+Zn(OH)_2\to Na_2ZnO_2+2H_2O\\2OH^-+Zn)OH)_2\to ZnO^-_2+2H_2O$
$h. FeS+2HCl\to FeCl_2+H_2S↑\\ FeS+2H^+\to Fe^{2+}+H_2S$
$i. CuSO_4+H_2S\to CuS+H_2SO_4\\ Cu^{2+}+H_2S\to CuS+2H^+$
$k. NaOH+NaHCO_3\to Na_2CO_3+H_2O\\OH^-+HCO^-_3\to CO^{2-}_3+H_2O$
$l. NaHCO_3+HCl\to NaCl+CO_2+H_2O\\HCO^-_3+H^+\to CO_2+H_2O$
$m. Ca(HCO_3)_2+2HCl\to CaCl_2+CO_2+2H_2O\\HCO^-_3+H^+\to CO_2+H_2O$
Câu 3:
a. $BaCl_2+Na_2CO_3\to BaCO_3+2NaCl$
b. $NH_4Cl+NaOH\to NaCl+NH_3+H_2O$
c. $Na_2S+2HCl\to 2NaCl+H_2S$
d. $3KOH+FeCl_3\to Fe(OH)_3↓+3KCl$
e. $AgNO_3+NaCl\to AgCl+NaNO_3$
f. $HCl+NaOH\to NaCl+H_2O$
