Strength of acid

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IreneSeo3F
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Strength of acid

Postby IreneSeo3F » Sun Dec 13, 2020 11:08 am

On sapling #11, can someone explain why HClO is more acidic than HIO? Wouldn't HIO be more acidic because I has greater radius?

Jordan Tatang 3L
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Re: Strength of acid

Postby Jordan Tatang 3L » Sun Dec 13, 2020 11:24 am

For that one, you would look at the product and HClO would be stronger because Cl has a greater electronegativity than I so it stabilizes more efficiently.

Chem_Mod
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Re: Strength of acid

Postby Chem_Mod » Sun Dec 13, 2020 11:25 am

These are oxo-acids. The H atom is bonded to the O atom. Same O-H bond in both acids is broken. Need to look at relative stability of anion.

Malakai Espinosa 3E
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Re: Strength of acid

Postby Malakai Espinosa 3E » Sun Dec 13, 2020 1:15 pm

HClO is more acidic because in the anion, Chlorine is more electronegative which stabilizes the anion more.

Charmaine Ng 2D
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Re: Strength of acid

Postby Charmaine Ng 2D » Sun Dec 13, 2020 1:17 pm

Since Chlorine is more electronegative, it has more electron-withdrawing power, which makes the overall anion more stable.

705340227
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Re: Strength of acid

Postby 705340227 » Mon Dec 14, 2020 10:59 pm

I believe that if the O wasn't present, then you would be right and the radius would be the defining factor in the acidity

Ke Huang 2G
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Re: Strength of acid

Postby Ke Huang 2G » Tue Dec 15, 2020 12:03 am

Chlorine is more electronegative.

Sam Wentzel 1F 14B
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Re: Strength of acid

Postby Sam Wentzel 1F 14B » Tue Dec 15, 2020 2:52 am

Chlorine has a higher electronegativity, so it pulls H's electron (within the O-H bond) closer to the C, making the H more "available" to be donated, resulting in higher acidity.

Michelle Magana 2B
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Re: Strength of acid

Postby Michelle Magana 2B » Tue Dec 15, 2020 12:10 pm

Chlorine has a higher electronegativity and helps stabilizes the anion

Justin Zhang_1A
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Re: Strength of acid

Postby Justin Zhang_1A » Tue Dec 15, 2020 12:40 pm

Chlorine is more electronegative than iodine, so the anion is more stable, therefore it is more acidic.

Izamary Marquez 2H
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Re: Strength of acid

Postby Izamary Marquez 2H » Tue Dec 15, 2020 9:58 pm

Can someone explain how a more stable atom creates a molecule that is more acidic? If it has a higher electronegativity, wouldn't that mean that it holds on to the H+ atoms more strongly, therefore making it harder to release them? Thanks!

reyvalui_3g
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Re: Strength of acid

Postby reyvalui_3g » Wed Dec 16, 2020 4:15 pm

In oxo acids the stronger acid is the one that has an atom with greater electronegativity. This is because this atom will pull electrons away from the oxygen and make it easier for it to deprotonate in solution.

Melissa Solis 1H
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Re: Strength of acid

Postby Melissa Solis 1H » Wed Dec 16, 2020 4:20 pm

Izamary Marquez 2L wrote:Can someone explain how a more stable atom creates a molecule that is more acidic? If it has a higher electronegativity, wouldn't that mean that it holds on to the H+ atoms more strongly, therefore making it harder to release them? Thanks!


In general, the strength of an acid is directly proportional to the stability of the acid's conjugate base. Meaning that an acid that has a more stable conjugate base will be more acidic than an acid that has a less stable conjugate base. You're right on the fact that the higher the electronegativity, the harder it is to get those H+ atoms.


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