Calculating Lattice Energy: LiF vs. CsF

  • Thread starter Thread starter outofmines
  • Start date Start date
  • Tags Tags
    Energy Lattice
Click For Summary
SUMMARY

The discussion focuses on calculating the lattice energy of lithium fluoride (LiF) and cesium fluoride (CsF). It establishes that the lattice energy is influenced by the distance between ion centers, denoted as 'r', and that larger ions result in a greater 'r' value. Consequently, LiF, with smaller ions compared to CsF, exhibits a more exothermic lattice energy due to its lower 'r' value, confirming the inverse relationship dictated by Coulomb's law.

PREREQUISITES
  • Coulomb's law for ionic interactions
  • Understanding of ionic compounds and their structures
  • Knowledge of ion sizes and their impact on lattice energy
  • Basic principles of thermodynamics related to exothermic reactions
NEXT STEPS
  • Study the application of Coulomb's law in lattice energy calculations
  • Research the factors affecting ionic radii and their implications
  • Explore the concept of lattice energy in other ionic compounds
  • Learn about the Born-Haber cycle and its relation to lattice energy
USEFUL FOR

Chemistry students, materials scientists, and anyone interested in the thermodynamic properties of ionic compounds.

outofmines
Messages
2
Reaction score
0
I'm having some problems with the calculations associated with this problem:

Which compound in each of the following pairs of ionic substances has the most exothermic lattice energy?

(a) LiF
CsF

I know I need to use Coulomb's law, but I don't know how to calculate r (the distance between the ion centers)

Any help is greatly appreciated. Thanks
 
Physics news on Phys.org
nevermind, I have found out that bigger ions have a bigger r value and thus via the inverse proportionality the higher lattice energy corresponds to the lower r value
 

Similar threads

Determination of lattice energy of an ionic compound
  • · Replies 2 ·
Replies
2
Views
2K
Calculating lattice energy on ionic compound
  • · Replies 1 ·
Replies
1
Views
18K
Theoretical Lattice Energy for MgF2
  • · Replies 11 ·
Replies
11
Views
11K
Lattice energy and energy required to vaporize MgO ?
  • · Replies 11 ·
Replies
11
Views
4K
High School Calculating the Total Energy of a lattice w/ the Madelung constant
  • · Replies 1 ·
Replies
1
Views
2K
Energy gaps for quasi-free electrons in a 2D lattice
  • · Replies 1 ·
Replies
1
Views
1K
Largest Lattice Energy: NaCl, CaO, Li2O, or CaCl2?
  • · Replies 4 ·
Replies
4
Views
30K
Graduate Green's function calculation of an infinite lattice with periodicity in 1D
  • · Replies 1 ·
Replies
1
Views
2K
Calculating First Ionization Energy
  • · Replies 2 ·
Replies
2
Views
8K
Lattice Energy and the Born Haber Cycle
  • · Replies 2 ·
Replies
2
Views
8K