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Why Is Heat Produced When We Add Water (H2O) To Calcium Oxide (Cao)?

heat water quick lime

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#1 Tolinorton

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Posted 30 December 2019 - 12:40 PM

Why is heat produced when we add water (H2O) to calcium oxide (CaO)?

#2 breizh

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Posted 30 December 2019 - 07:12 PM

Hi,

From literature :

 

CaO (s) + H2O (l)  --- >     Ca (OH) 2 (aq) (∆Hr = −63.7 kJ/mol of CaO)

exothermic reaction

Check for slaking of lime using your favorite search engine .

Breizh 


Edited by breizh, 01 January 2020 - 06:20 AM.


#3 latexman

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Posted 31 December 2019 - 11:24 AM   Best Answer

The elements Ca, O, H changed to a lower energy state giving that energy to the environment.  It became a more stable (lower energy) form.



#4 Chemitofreak

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Posted 02 January 2020 - 02:00 AM

The elements Ca, O, H changed to a lower energy state giving that energy to the environment.  It became a more stable (lower energy) form.

 

This is the best and simplest explanation possible. Even a layman can understand that...!  






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