a) Ba(OH)2+2HCl--->BaCl2+2H2O
Ba2+ +2OH- +2H+ +2Cl- --->Ba2+ +2Cl- +2H2O
2OH- +2H+ --->2H2O
b) 2LiOH+H2SO4--->Li2SO4+2H2O
2Li+ +2OH- +2H+ +SO4 2- --->2Li+ +SO4 2- +2H2O
2OH- +2H+ --->2H2O
c) NaOH+HNO3--->NaNO3+H2O
Na+ +OH- +H+ +NO3- --->Na+ +NO3- +H2O
OH- +H+ --->H2O
d) Mg(OH)2+H2SO3--->MgSO3+2H2O
Mg2+ +2OH- +2H+ +SO3 2- --->Mg2+ +SO3 2- +2H2O
2OH- +2H+ --->2H2O