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Summary Born Haber cycle of Sodium Chloride
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This document gives details of how the Born Haber Cycle of Sodium Chloride can be calculated. It includes the drawing of the Born Haber Cycle and the lattice enthalpy of Sodium Chloride.

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Document information

  • March 11, 2024
  • 4
  • 2023/2024
  • Summary

Subjects

  • born haber cycle
  • ionic
  • ionic compounds
  • sodium chloride
  • 1st ionization energy
  • atomization
  • electron affinity

Written for

  • A/AS Level
  • AQA
  • A Level Chemistry
  • Born Haber Cycle
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ENERGY CHANGES IN FORMING IONIC SUBSTANCES

The lattice energy of an ionic crystals is the heat of formation for one mole of

the ionic compound from gaseous ions under standard conditions. Thus, the

lattice energy of sodium chloride corresponds to the process:


Na+ (g) + Cl- (g) Na+ Cl- (s) H latt (Na+Cl-(s))

Lattice energies cannot be determined directly, but values can be obtained

indirectly by means of an energy cycle connecting the ionic solid, the gaseous

ions and the elements in their standard states.


H×
Na (s) + ½ Cl2 (g) Na+ (g) + Cl- (g)




HfO (Na+ Cl- (s)) H latt (Na+ Cl- (s))

Na+ Cl- (s)

Since HfO, the standard heat of formation of sodium chloride can be

measured conveniently in a calorimeter, H latt can be obtained if H× can

be found.




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