June 18, 2021, 10:45:17 PM
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Topic: Question about enthalpy  (Read 189 times)

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Offline julien08

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Question about enthalpy
« 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.
« Last Edit: May 31, 2021, 04:00:36 PM by julien08 »

Offline Orcio_Dojek

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Re: Question about enthalpy
« Reply #1 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 !

Offline julien08

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Re: Question about enthalpy
« Reply #2 on: June 01, 2021, 08:49:56 AM »
thank you very much

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