Electronegativity vs Bond length

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Ethan-Van To Dis2L
Posts: 50
Joined: Fri Sep 29, 2017 7:05 am

Electronegativity vs Bond length

Postby Ethan-Van To Dis2L » Thu Dec 07, 2017 2:08 pm

So in lecture, he said that the shorter and stronger the bond, the weaker the acid since the H+ ion cannot break free of the molecule which makes sense, but in 12.9 of the book it says that the greater electronegativity, the stronger the acid since it makes the H-A molecule more polar and ionic meaning it is more likely to dissociate. So HF should be weaker than HCl based on the bond length and strength, but HF should also be stronger than HCl based on their electronegativity. Which one should we consider more when determining the acid strength or is it circumstantial?

Justin Lau 1D
Posts: 51
Joined: Sat Jul 22, 2017 3:00 am

Re: Electronegativity vs Bond length

Postby Justin Lau 1D » Thu Dec 07, 2017 2:11 pm

When you are looking at elements in the same period, electronegativity is the primary factor in determining acid strength. However, when you're looking at elements in a group, it's the bond length.

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