Hydration Energy Definition and Trend in Periodic Table.

Your Questions: What is Hydration Energy Definition? What is the trend of Hydration energy in Periodic table.

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Hydration Energy Definition:

The hydration energy is the heat absorbed or evolved when one mole of gaseous ions dissolve in water to give an infinity dilute solution.

Example:

When one mole of gaseous hydrogen ions are dissolved in water resulting an infinity dilute solution, a large amount of heat is liberated.

On which factor Hydration energy depends upon?

Hydration energies highly depends upon charge to size ratio of the ions.

Variation Within Group:

Lets take an example from group IA, charge to size ratio decreases from top to bottom in a group. The hydration energy also decreases in the same fashion.

Variation across Period:

On the contrary, the hydration energy increases significantly by moving from left to right in a period as the charge to size ratio increases, as found in metal ions of third period.

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Fawad's Chemistry

Hope you fine. I'm Fawad and author of this blog "Chemanalogy". Love to write on Chemistry. Currently teaching A Levels, O Levels and University Chemistry offline as well as online. Connect to chemanalogy community by subscribing via email.
  • Noor Elahi

    With due respect, Can you plz explain the exact trend of H.E along the period.
    According to above F- must have greater H.E than others but it has lower H.E even from Li+.
    Why is it so?