Đặt:
nNa2O= nNaHCO3= nBaCl2= nNH4Cl= a mol
Na2O + H2O --> 2NaOH
a_______________2a
NaOH + NH4Cl--> NaCl + NH3 + H2O
Bđ: 2a_______a
Pư: a________a_______a
Kt: a________0_______a
NaOH + NaHCO3 --> Na2CO3 + H2O
a_________a___________a
Na2CO3 + BaCl2 --> 2NaCl + BaCO3
a__________a________2a_____a
Dung dịch A : 3a mol NaCl
Kết tủa B: a mol BaCO3