How does solubility depend on lattice energy and hydration energy?

If there is a net release of energy, that is, if more energy is released on hydration than is stored in the ionic solid lattice, then solubility is favored. If there is a net gain of energy, that is, if less energy is released on hydration than is stored in the ionic solid lattice, then solubility is unfavored.

How does solubility relate to lattice energy?

If the lattice energy (cost) is larger than the energy of solvation of the ions (gain) the compound won’t dissociate, and it will be insoluble. There is a large grey area where lattice energy and solvation energy are close, and for those compounds temperature has a big influence on solubility.

How does lattice structure affect solubility?

Chemical theory has not reached the point where it can predict exactly how much of one substance will dissolve in another. Thus gases, whose molecules are far apart and exert negligible forces on one another, are all completely miscible with other gases. …

What is the relationship between lattice energy and hydration energy?

Lattice energy and hydration energy are two important properties of ionic solids on which their melting point, boiling point and solubility depend. Lattice energy increases as the charge on the ion increases and the size decreases. Hydration energy increases as the size of the ion decreases and charges on it increases.

What is hydration energy and lattice energy?

Lattice energy is the amount of energy released when a mole of the lattice is formed from infinitely separated ions. Hydration energy is the amount of energy released when a lattice is separated into ions by solvation in water.

What happens when hydration energy is greater than lattice energy?

If the hydration energy is greater than the lattice energy, then the enthalpy of solution is negative (heat is released), otherwise it is positive (heat is absorbed). If the solvation energy is positive, then the solvation process is endergonic; otherwise, it is exergonic.

Is lattice energy inversely proportional to solubility?

“Decreasing lattice energy favours increased solubility while decreasing hydration energy favours decreased solubility.”

On what factors hydration energy depends?

The magnitude of hydration enthalpy depends on the charge density of the ions. The charge density is more for smaller ions and hence the smaller ions have higher values of hydration enthalpy. The higher the charge density the higher will be the force of attraction between the ion and the water polar end.