What is Born-Haber cycle? Give its basis.
Explain why NaCl is soluble in water whereas
BaSO4 is not.
Answers
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Answer:
The Born–Haber cycle is an approach to analyze reaction energies. ... A Born–Haber cycle applies Hess's law to calculate the lattice enthalpy by comparing the standard enthalpy change of formation of the ionic compound (from the elements) to the enthalpy required to make gaseous ions from the elements.
NaCl is an ionic compound i.e it's composed of anion and cation . When it is added to water the negatively charged hydroxyl ion attracts the positively charged sodium ion and positively charged hydronium ion attracts negatively charged chloride ions and thus there is a bond cleavage resulting in the formation of ions in water and thus it dissolves in water.
In the alkaline earth metals, the lattice energy of sulphates remains constant but the hydration energy decreases from Be 2+
to Ba 2+ appreciably as the size of cation increases down the group. Hence, due to decrease in hydration energy, the solubility of sulphates decreases down the group.
at the bottom of the group the solubility of BaSO4 becomes least and it becomes insoluble in water.