- BaCl2,Na2SO4BaCl _{2}, Na _{2} SO _{4}
- Na2CO3,Ba(OH)2Na _{2} CO _{3}, Ba ( OH )_{2}
- BaCl2,AgNO3BaCl _{2}, AgNO _{3}
- NaCl,K2SO4NaCl , K _{2} SO _{4}