[julien08]

Hello, i don't know how to explain this:
Use the ionic model for reticular enthalpy (ΔHr) and hydration (ΔHh) to explain which is the strongest base: magnesium hydroxide or barium hydroxide.

[Orcio_87]

Reticular and hydration enthalpies can be used to calculate enthalpy of reaction:

Mg(OH)₂(s) ---H₂O---> Mg²⁺ (aq) + 2 OH^-(aq) + ΔH

But....

Reaction constant depends also on its enthropy, which is unknown.

And - when someone thinks about acid-basic properties, usually it is reffered to liquid (aqueous) not solid compounds.

Determining which (Mg(OH)₂ or Ba(OH)₂) is stronger base can be very inaccurate !

[julien08]

thank you very much