Odpowiedź :
BaCl2
1. Ba(OH)2+2HCl--->BaCl2+2H2O
Ba2+ +2OH- +2H+ +2Cl- --->Ba2+ +2Cl- +2H2O
2OH- +2H+ --->2H2O
2. Ba+2HCl--->BaCl2+H2
3. BaO+2HCl--->BaCl2+H2O
Na2CO3
1. 2NaOH+H2CO3--->Na2CO3+2H2O
2Na+ +2OH- +2H+ +CO3 2- --->2Na+ +CO3 2- +2H2O
2OH- +2H+ --->2H2O
2. 2Na+H2CO3--->Na2CO3+H2
3. Na2O+H2CO3--->Na2CO3+H2O
Li2S
1. 2LiOH+H2S--->Li2S+2H2O
2Li+ +2OH- +2H+ +S2- --->2Li+ +S2- +2H2O
2OH- +2H+ --->2H2O
2. 2Li+H2S--->Li2S+H2
3. Li2O+H2S--->Li2S+H2O
Mg(NO3)2
1. Mg(OH)2+2HNO3--->Mg(NO3)2+2H2O
Mg2+ +2OH- +2H+ +2NO3- --->Mg2+ +2NO3- +2H2O
2OH- +2H+ --->2H2O
2. Mg+2HNO3--->Mg(NO3)2+H2
3. MgO+2HNO3--->Mg(NO3)2+H2O