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15.2.4 Discuss differences between theoretical/experimental lattice enthalpy values IB Chemistry HL

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Uploaded on Oct 29, 2011

15.2.4 Discuss the difference between theoretical and experimental lattice enthalpy values of ionic compounds in terms of their covalent character. The larger the difference between experimental and theoretical lattice energies, the more covalent the character of the lattice.
The theoretical lattice energy comes from the Borne-Haber cycle, which is all about the ions, ions everywhere! This assumes 100% ionic character in the calculation. The closer the experimental value is to this -- the more ionic is the actual lattice.
Elements with a larger difference in electronegativity ("electron-love") will be more ionic in a compound since they have a greater difference in their electrophobic/philic nature and therefore are more likely to transfer electrons (=ionic).
Another factor is that a positive ion with a high charge density will attract the negative ions electrons over towards itself and maybe even have some overlap (=covalent).

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