How is hydration enthalpy used to determine solubility?

Hydration energy (also hydration enthalpy) is the amount of energy released when one mole of ions undergo hydration which is a special case of solvation. It is a special case of dissolution energy, with the solvent being water. read more

If the hydration energy is equal to or greater than the lattice energy, then the salt is water-soluble. In salts for which the hydration energy is higher than the lattice energy, solvation occurs with a release of energy in the form of heat. For instance, CaCl2 (anhydrous calcium chloride) heats the water when dissolving. read more

Hydration energy is the energy librated when something is dissolve in water. If the hydration energy is greater than lattice energy substance will soluble. Lattice energy is the amount of energy which bound the crystal lattice. LiF is insoluble in water because it's lattice energy is higher than hydration energy. read more

Decreasing the energy required to separate the solute particles and increasing the energy of solvation of the particles will increase the solubility if a substance. The solution process involves three steps. Separation of solvent particles; ΔH_1 >0. Separation of solute particles, ΔH_2 >0. Solvation of solute particles, ΔH_3 < 0. read more