ENTHALPIES OF HYDRATION

• EXAMPLE OF AN ENTHALPY OF SOLUTION EQUATION (USING CHLORINE)?

  Cl- (g) + aq -> Cl- (aq)
• WHAT CHANGES WITH CHARGE DURING ENTHALPY OF HYDRATION?

  • higher change
  • greater attraction to water
  • more exothermic reaction
  • more stable ion formed
• WHAT ARE THE FACTORS AFFECTING HYDRATION ENTHALPY?

  attraction strength (between ions and water molecules) and ion size
• HOW DOES ION SIZE AFFECT HYDRATION ENTHALPY?

  smaller ion size = stronger attraction due to a high charge density