Heat of Hydration
Definition - What does Heat of Hydration mean?
Heat of Hydration, also known as hydration enthalpy is the amount of heat that is dissipated or absorbed when one molecule or ion undergoes the hydration process. Heat of hydration is a part of dissolution of energy in which water is kept as a solvent. This simply means that ions or molecules of the solvent get attracted and associated toward the molecules or the ions of the solute. When such phenomenon happens, heat is usually absorbed or dissipated.
Petropedia explains Heat of Hydration
Heat of hydration occurs as a result of dissolution of energy, also called solvation process. During a solvation process, the solute is completely dissolved in the solvent and thus the molecules or ions of the solute evenly spread around the solvent molecules. In other words, they completely bond with the solvent molecules.
Crude oil being denser than water will always float on it and thus, there is no occurrence of heat of hydration phenomenon in this case. Oil and water do not mix due to the fact that water molecules get attracted to their own molecules rather getting attracted to crude oil molecules.