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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: julien08 on May 31, 2021, 03:11:21 PM

Title: Question about enthalpy
Post by: julien08 on May 31, 2021, 03:11:21 PM
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.
Title: Re: Question about enthalpy
Post by: Orcio_87 on May 31, 2021, 06:49:48 PM
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 !
Title: Re: Question about enthalpy
Post by: julien08 on June 01, 2021, 08:49:56 AM
thank you very much