Respuesta :
The size of the hydration enthalpy is governed by the amount of attraction between the ions and the water molecules.
The attractions are stronger the smaller the ion. For example, hydration enthalpies fall as you go down a group in the Periodic Table.
The attractions are stronger the more highly charged the ion.
The hydration enthalpy will be larger for smaller ions because they can fit more water molecules around them and become hydrated.
- The amount of heat that is released or absorbed during the dissolving process is known as the enthalpy change of solution (at constant pressure).
- There are two possible values for this enthalpy of solution (H solution): positive (endothermic) and negative (exothermic).
- Because of the extra valence shells added down the group, the atom's group size increases, causing a decrease in hydration enthalpy.
- Because of the extra valence shells added down the group, the atom's group size increases, causing a decrease in hydration enthalpy.
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