what is lattice enthalpy? how do you calculate the lattice enthalpy of NACL by using born-haber cycle
Answers
Answer:The lattice energy is supposed to be the enthalpy change of the process in which isolated ions combine to form an ionic solid. This process cannot be realistically carried out in the laboratory because you would basically have to take separate samples of, say, gaseous Na+ and gaseous Cl- and then combine them and measure the amount of heat evolved. But the electrostatic force is long-ranged and you simply can't prepare ions without counter-ions at an appreciable density---the energy and pressure involved would be immense. [
sodium chloride it is ΔHΔH for:
Na+(g)Na(g)+ ++ Cl−(g)Cl(g)− →→ NaCl(s)NaCl(s)
To find out how it is calculated look up The Born Haber Cycle which is essentially an application of Hess' Law.
It can be used to asses the strength of attraction of ions in a lattice.
Theoretical values can be calculated from electrostatic principles. If we then compare Born - Haber i.e experimental values with those from the electrostatic model we can get an idea of the % age ionic character of a bond e.g for NaCl the agreement is very good indicating high ionic character. For AlCl3 the agreement is much less indicating much less ionic character.
Using theoretical values of lattice energy you can calculate a value of ΔHfΔHf for a hypothetical compound.
Can be used to find enthalpies of hydration.
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Explanation: