For a particular salt, the true lattice energy is -436 kJ/moland the hydration e

Question

For a particular salt, the true lattice energy is -436 kJ/moland the hydration energy is -548 kJ/mol. If the heat of solutionfor the salt were a a function just of these two energies, what isits value? What is the formation of the solution (exothermic orendothermic) Please EXPLAIN youranswer. For a particular salt, the true lattice energy is -436 kJ/moland the hydration energy is -548 kJ/mol. If the heat of solutionfor the salt were a a function just of these two energies, what isits value? What is the formation of the solution (exothermic orendothermic) Please EXPLAIN youranswer.

Explanation / Answer

This particular salt dissolving in water goes from its latticeenergy, -436 kJ/mol, to it's hydration energy, -548 kJ/mol. We can see that the hydration energy is LOWER than thelattice energy, suggesting that the hydrated form is more stable. Immediately, you can see that going from -436 kJ/mol to -548kJ/mol must be exothermic, and the heat of solutionis simply the difference between the two values given.

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