Energy/Enthalpy of hydration

Energy/Enthalpy of hydration

Energy/Enthalpy of hydration

This refers to the enthalpy change when 1mole of gaseous ions is hydrated. e.g.

Na+(g) + aq → Na+(aq)                                      ∆HmӨ(298K) = -406 kJmol-1

Factors affecting the magnitude of lattice energy

  • Size of the ion: small ions have strong attraction to water molecules leading to high hydration energy.
  • Charge on the ions: ions with high big charge have a strong attraction to water molecules leading to high enthalpy of hydration.

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