- CuSO4,Ba(OH)2,Na2CO3CuSO4,Ba(OH)2,Na2CO3CuSO _{4}, Ba ( OH )_{2}, Na _{2} CO _{3}
- FeCl2FeCl2FeCl _{2}, AgNO3,Ba(OH)2AgNO3,Ba(OH)2AgNO _{3}, Ba ( OH )_{2}
- NaHSO4,Ba(HCO3)2,Fe(NO3)3NaHSO4,Ba(HCO3)2,Fe(NO3)3NaHSO _{4}, Ba \left( HCO _{3}\right)_{2}, Fe \left( NO _{3}\right)_{3}
- FeSO4,Ba(OH)2,(NH4)2CO3FeSO4,Ba(OH)2,(NH4)2CO3FeSO _{4}, Ba ( OH )_{2},\left( NH _{4}\right)_{2} CO _{3}