Acid Strength

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Abby Ellstrom 1I
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

Acid Strength

Postby Abby Ellstrom 1I » Fri Dec 08, 2017 12:29 am

Why is HF a stronger acid then HCl? I thought acid strength in this sense was determined by the electronegativity of the atom bonded to the H+ ion. Cl is more electronegative then F but on the homework it said that HF was stronger than HCl.

Minie 1G
Posts: 63
Joined: Fri Sep 29, 2017 7:04 am

Re: Acid Strength

Postby Minie 1G » Fri Dec 08, 2017 12:35 am

I think you might be mistaken, HCl is a stronger acid than HF.

There are 7 common strong acids and HCl is on that list, HF is not.

Ethan Vuong 3G
Posts: 51
Joined: Fri Sep 29, 2017 7:07 am

Re: Acid Strength

Postby Ethan Vuong 3G » Fri Dec 08, 2017 3:05 am

Yeah so HCl should be more acidic because it has a larger radius, therefore increasing the bond length between Cl and the H ion. This decreases the energy that it has, which makes it more stable. The more stable, the more acidic.

Chloe Blume 1F
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Joined: Fri Sep 29, 2017 7:04 am

Re: Acid Strength

Postby Chloe Blume 1F » Fri Dec 08, 2017 2:39 pm

How can you determine what is a strong acid vs a weak acid?

Rummel Requerme 1E
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Joined: Fri Sep 25, 2015 3:00 am
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Re: Acid Strength

Postby Rummel Requerme 1E » Sun Jun 10, 2018 6:13 pm

Chloe Blume 1F wrote:How can you determine what is a strong acid vs a weak acid?

I wonder the same thing, but I've heard one should focus on the conjugate base. The more stable base has the stronger acid.

Anthony Mercado 1K
Posts: 27
Joined: Fri Apr 06, 2018 11:04 am

Re: Acid Strength

Postby Anthony Mercado 1K » Sun Jun 10, 2018 8:53 pm

In addition, to find which compound has more basic strength, basicity, would you also have to compare conjugate acids? *That is, discovering the conjugate acid of the basic compound, ranking those on acidity, and then reversing the order ranked to find the most/least basic?


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