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Ionization of acids and its relationship to endo/exothermic processes
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Josh_4080
#1 Posted : Tuesday, July 14, 2020 8:57:12 PM
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Im reading that ionization of an acid is exothermic, but im also reading that dissociation of an acid is endothermic...

So I am thinking that dissociation is just referring to the process of H+ leaving, while ionization is the process of H+ leaving and also forming H3O+? Thus bond breaking is still endothermic (which is dissociation), but for ionization you are breaking and forming bonds, and forming the bond is more exothermic than breaking it, so you have an overall exothermic process?

Hopefully this makes sense...


Thanks!!
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INSTR_Katerina_102
#2 Posted : Wednesday, July 15, 2020 1:59:00 PM
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Yeah, I understand what you're saying.

I don't tend to think about this in such great detail, at the level of the MCAT you usually just get tested on one concept and don't get tested on deeper physical chemistry like this.

But yeah, I'm pretty sure if you just have H-A --> H+ + A- in a vacuum, you technically don't have any stabilizing forces to make this happen (which is why you can have pure, mainly undissociated H2SO4 before you put it in water).

The solvation really helps in the dissociation of the acid.

The only problem that I can see in what you've said is that the dissociation of HA --> H+ + A- is that it is technically also an ionization as you are making ions.

I hope this helps.

Katt
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