Enthalpy cycles

• Enthalpy change of solution


  • enthalpy change when one mole of a solute dissolves in water
  • both exothermic and endothermic
  • e.g NaCl(s) -> Na+(aq) + Cl-(aq)
  • e.g MgF2(s) -> Mg2+(aq) + 2F-(aq)
• enthalpy change of hydration

  • enthalpy change when one mole of gaseous ions are dissolved in water
  • exothermic (Bonds formed)
  • e.g Na+(g) -> Na+(aq)
  • e.g F-(g) -> F-(aq)