Ba(OH)2 + MgSO4 →BaSO4↓+Mg(OH)2
Ba2+ +2OH- +Mg2+ +SO4 2- --->BaSO4↓ +Mg2+ +2OH-
Ba2+ +SO4 2- --->BaSO4↓
NaOH + HF →NaF+H2O
Na+ +OH- +H+ +F- --->Na+ +F- +H2O
OH- +H+ --->H2O
3LiOH + H3PO4→Li3PO4+3H2O
3Li+ +3OH- +3H+ +PO4 3- --->3Li+ +PO4 3- +3H2O
3OH- +3H+ --->3H2O