# Problem: NaCl and KF have the same crystal structure. The only difference between the two is the distance that separates cations and anions.CompoundLattice EnergykJ/molCompoundLattice EnergykJ/molLiF1030MgCl22326LiCl834SrCl22127LiI730NaF910MgO3795NaCl788CaO3414NaBr732SrO3217NaI682KF808ScN7547KCl701KBr671CsCl657The lattice energies of NaCl and KF are given in the table in the introduction. Based on the lattice energies, would you expect the Na-Cl or the K-F distance to be longer?

###### FREE Expert Solution

We’re being asked to determine which distance would be longer, Na-Cl or K-F.

To estimate the lattice energy (or ionic bond energy) of an ionic compound, we will use the following equation:

97% (321 ratings)
###### Problem Details
NaCl and KF have the same crystal structure. The only difference between the two is the distance that separates cations and anions.

 Compound Lattice EnergykJ/mol Compound Lattice EnergykJ/mol LiF 1030 MgCl2 2326 LiCl 834 SrCl2 2127 LiI 730 NaF 910 MgO 3795 NaCl 788 CaO 3414 NaBr 732 SrO 3217 NaI 682 KF 808 ScN 7547 KCl 701 KBr 671 CsCl 657

The lattice energies of NaCl and KF are given in the table in the introduction. Based on the lattice energies, would you expect the Na-Cl or the K-F distance to be longer?