why does HF have a strong bond strength?

[joonkimdds]

HI, HBr, HCl are strong acids because these have strong electronegativity so the electron of the bond goes toward them and H readily leaves.
But I read that HF is an exception because of the strong bond strength.

I don't know why it has strong bond strength if F is very electronegative.
I think it also draws electron toward F so H should readily leave.

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[doc3232]

Everything you said is right but you also need to look at delocalization. F- is not stable at all. You are putting a negative charge on a TINY atom. It has no where to space out this negative charge (starting to forget this stuff).

 

[Sublimation]

the main reason why HF is not a very strong acid is due to the short distance of the H-F bond.

 

[vhlam]

the main reason why HF is not a very strong acid is due to the short distance of the H-F bond.

exactly what i was gonna say. it's also easier for H to leave as you go down the group because the halogens are getting bigger, and thus, a relatively weaker bond.