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Hydration enthalpy

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Hydration Reaction. A hydration reaction is a chemical reaction. Water is one of the reactants that is transformed into products. One of the commonest hydration reactions is the hydration of alkenes to produce alcohols.

The hydration energy of an ionic compound consists of two inseparable parts. The first part is the energy released when the solvent forms a coordination compound with the ions. This energy released is called the Enthalpy of ligation, 螖 H l i g. The processes related to these energies are shown below:

Hydration enthalpy is also called hydration energy and its values are always negative. For a chemical reaction, M +(g) + aq 鈫?M +(aq) Enthalpy change = 鈭咹 Hyd Water is considered to be a polar solvent because it has a positive (H atom) and negative (O atom) poles.

Hydration is the incorporation of water molecule (s) into a mineral, which results in a structural as well as chemical change. This can drastically weaken the stability of a mineral, and make it very susceptible to other forms of chemical weathering. For example, hydration of anhydrite results in the formation of gypsum: