F and Cl in acids

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Tia Tomescu 2D
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Joined: Fri Sep 29, 2017 7:06 am

F and Cl in acids

Postby Tia Tomescu 2D » Mon Dec 04, 2017 8:01 pm

Why is HF a weak acid and HCl a strong one, while C2O2HF3 is a stronger acid than C2O2HCl3?

Lucian1F
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Re: F and Cl in acids

Postby Lucian1F » Mon Dec 04, 2017 8:30 pm

The strengths for these acids depend on different factors. Since the H-F bond is shorter than the H-Cl bond, HF is less likely to dissociate than HCl, so it is a weaker acid. However, in the case of C2O2HF3 and C2O2HCl3, the strength of the acid depends on electronegativity. Since F is more electronegative than Cl, when the acids lose their hydrogen, C2O2F3- will be more stable than C2O2Cl3- since the higher electronegativity of F will help stablize the anion. The more stable the anion the stronger the acid

Ishan Saha 1L
Posts: 60
Joined: Fri Sep 29, 2017 7:03 am

Re: F and Cl in acids

Postby Ishan Saha 1L » Mon Dec 04, 2017 8:33 pm

To add on to the previous response, C2O2HF3 is a stronger than C2O2HCl3, because the F atom is more electronegative than the Cl atom, which means that it will pull pull more electrons from the Oxygen, which thereby makes it easier for the oxygen to loose the H+ ion.


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