Weak Acid

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Maverick Tan 1F
Posts: 15
Joined: Fri Oct 07, 2016 3:02 am

Weak Acid

Postby Maverick Tan 1F » Fri Nov 25, 2016 1:37 pm

Can someone please explain why HF is a weak acid rather than a strong acid even though F belongs to the same group of anions that make strong acids.

Jenny_Thompson_3I
Posts: 25
Joined: Wed Sep 21, 2016 2:59 pm

Re: Weak Acid

Postby Jenny_Thompson_3I » Fri Nov 25, 2016 1:53 pm

HF is a weak acid due to the fact that it has a short and strong bond. For example HI is a stronger acid due to the fact that it has a large atomic radius and a short bond length, making it easier to break apart. Since HF has a smaller atomic bond it has a longer bond length making it more difficult to break, thus making it a weaker acid.

Amir Patel 1G
Posts: 20
Joined: Wed Sep 21, 2016 2:59 pm

Re: Weak Acid

Postby Amir Patel 1G » Fri Nov 25, 2016 3:10 pm

Since HF has a smaller atomic bond, wouldn't that mean it has a shorter bond length, which is why it is a weaker acid and harder to break the bond?

KelseyKobayashi_2M
Posts: 21
Joined: Sat Jul 09, 2016 3:00 am

Re: Weak Acid

Postby KelseyKobayashi_2M » Thu Dec 01, 2016 10:52 pm

This was one of the homework problems (12.51) where HF was a weaker acid than HCl, but in another part of that problem, it stated that HClO2 is a stronger acid than HBrO2 because Cl is more electronegative. So, why is HF a weaker acid if F is more electronegative than Cl?

Wesley_Rugen_1E
Posts: 23
Joined: Fri Jul 22, 2016 3:00 am

Re: Weak Acid

Postby Wesley_Rugen_1E » Thu Dec 01, 2016 11:43 pm

The bond strength is a large determining factor for acidity. The bond between HF is very strong, because fluorine does not want to let go of hydrogen.


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