Why does hydration enthalpy decrease with decrease in size.
Asked by | 7th Nov, 2012, 04:57: PM
Enthalpy of hydration, Hhyd, of an ion is the amount of energy released when a mole of the ion dissolves in a large amount of water forming an infinite dilute solution in the process,
Mz+(g) + mH2O ® Mz+(aq)
where Mz+(aq) represents ions surrounded by water molecules and dispersed in the solution.
As the atomic numbers increases, so do the ionic size, leading to a decrease in absolute values of enthalpy of hydration. For exmple;
Enthalpy of Hydration (Hhyd kJ/mol) of Some Typical Ions
Ion Hhyd Ion Hhyd Ion Hhyd
Answered by | 9th Nov, 2012, 10:40: AM
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