Empirical Formulae

• Ca2+ and F-

  • In order for the charges to balance out and for the overall formula to be neutral, there must be 2 F- ions for each Ca2+ ion.
  • The empirical formula is CaF2.

  
• Na+ + SO42-

  • In order for the charges to balance out and for the overall formula to be neutral, there must be 2 Na+ ions for each SO42- ion.
  • The empirical formula is Na2SO4.