- NaOH,MgSO4NaOH , MgSO _{4}
- KCl,Na2SO4KCl , Na _{2} SO _{4}
- CaCl2CaCl _{2}, NaNO3NaNO _{3}
- ZnSO4,H2SO4ZnSO _{4}, H _{2} SO _{4}