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Kavee Dodampahala 4E
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Joined: Sat Jul 20, 2019 12:17 am


Postby Kavee Dodampahala 4E » Fri Dec 06, 2019 5:05 pm

Why is HF not a strong acid even though fluorine is very electronegative?

Posts: 103
Joined: Thu Jul 25, 2019 12:15 am

Re: HF

Postby 005391550 » Fri Dec 06, 2019 5:06 pm

because F is so electronegative, it pulls electrons harder and the bond between H and F is stronger and so HF doesn't lose protons (H+) as easily.

Ying Yan 1F
Posts: 101
Joined: Fri Aug 02, 2019 12:16 am

Re: HF

Postby Ying Yan 1F » Fri Dec 06, 2019 7:28 pm

^Furthermore, because F is so electronegative, the H-F bond is shorter, and make it harder for the H+ ion (aka proton) to dissociate from the HF molecule.

Fiona Latifi 1A
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Joined: Sat Sep 14, 2019 12:16 am

Re: HF

Postby Fiona Latifi 1A » Fri Dec 06, 2019 8:19 pm

HF also has a relatively large pKa value and a small Ka value, which makes it a weak acid.

Juliet Stephenson 4E
Posts: 100
Joined: Wed Sep 18, 2019 12:21 am

Re: HF

Postby Juliet Stephenson 4E » Fri Dec 06, 2019 9:23 pm

HF is a weak acid because the H-F bond is incredibly strong due to the electronegativity of F and the small atomic radius of F. As a result, it has short bonds that aren't equally broken, which translates to low levels of dissociation.

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