Which is the stronger acid?

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AKatukota
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Joined: Thu Jul 25, 2019 12:18 am

Which is the stronger acid?

Postby AKatukota » Tue Dec 03, 2019 11:19 am

For HClO vs HClO2, how would you reason that HClO2 is the stronger acid? In the textbook it said it was based on the greater number of O atoms in HClO2, but why?

Thank you!

Bita Ghanei 1F
Posts: 60
Joined: Thu Feb 28, 2019 12:15 am

Re: Which is the stronger acid?

Postby Bita Ghanei 1F » Tue Dec 03, 2019 11:24 am

To answer this question, draw the structures of the resulting anion (conjugate base) and evaluate the stability. To draw the lewis structure of the anion, draw the original lewis structure and erase an H and put a negative.
The stronger acid creates the more stable anion.
HClO2 is stronger than HClO because HClO2's resulting anion has resonance, which delocalizes the negative charge and creates more stability.

605208780
Posts: 50
Joined: Wed Sep 18, 2019 12:16 am

Re: Which is the stronger acid?

Postby 605208780 » Tue Dec 03, 2019 11:35 am

In both molecules the oxygens are bonded to the chlorine but not to the hydrogen and thus draw the electrons in the O—H bond towards the chlorine and the oxygen, making the O—H bond more polar. This effects chloric acid more than chlorous acid, since the hydrogen will more readily dissociate in a more polar bond

Trent Yamamoto 2J
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Joined: Sat Aug 17, 2019 12:18 am

Re: Which is the stronger acid?

Postby Trent Yamamoto 2J » Sat Dec 07, 2019 10:16 pm

Having more one more O will increase stability because the negative charge is dispersed more, which increases stability.

Frankie Mele 3J
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Joined: Wed Sep 30, 2020 10:09 pm

Re: Which is the stronger acid?

Postby Frankie Mele 3J » Tue Dec 08, 2020 2:23 pm

Generally, when more O atoms are added to the central atom, the negative charge is dispersed more evenly. The protons will then be less strongly attached to the oxygens, resulting in a stronger acid.

Mary Shih 3J
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Re: Which is the stronger acid?

Postby Mary Shih 3J » Tue Dec 08, 2020 6:32 pm

if you draw the lewis structure, you can see that the two O that have a large E.N. will cause electron withdraw. Because of the stronger distribution of charges, it is stronger

Mary Shih 3J
Posts: 101
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Re: Which is the stronger acid?

Postby Mary Shih 3J » Tue Dec 08, 2020 6:33 pm

you can also think of the electronegativity in the two O 'diluting' the charge, making it easier to break the bond the molecule

darchen3G
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Re: Which is the stronger acid?

Postby darchen3G » Tue Dec 08, 2020 6:34 pm

With the extra oxygen, the electrons are pulled further away from the bond containing the hydrogen, making it weaker and more easy to break.

Nick Saeedi 1I
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Joined: Wed Sep 30, 2020 9:39 pm

Re: Which is the stronger acid?

Postby Nick Saeedi 1I » Thu Dec 10, 2020 7:03 pm

Have more oxygens will delocalize the charge more and make it easier to break the bond which results in it being a stronger acid.

AmyHo2K
Posts: 99
Joined: Wed Sep 30, 2020 9:39 pm

Re: Which is the stronger acid?

Postby AmyHo2K » Fri Dec 11, 2020 12:07 am

Having the additional Oxygen would make the acid more stable because the charge would be spread out more and therefore stronger.


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