Finding dissociation constant for f-

[LegitSci]

If I'm given the dissociation constant for HF, how would I find the dissociation constant for F-?

Thanks in advance.

 

[Borek]

F^- doesn't dissociate.

 

[LegitSci]

So is it just the equal to the dissociation constant of the HF acid itself or something

 

[LegitSci]

I didn't really get the question either

 

[Borek]

My bet is that the question is related to the Bronsted-Lowry theory, just poorly worded.

 

[LegitSci]

Can you explain what you mean

 

[Borek]

Have you checked what the Brønsted-Lowry theory is?

 

[LegitSci]

Yes, but I don't see the correlation

 

[LegitSci]

It simply states that the acids donate H+ and bases accept H+

 

[Borek]

It says a lot more, as a simple consequence of this fact.

http://www.chembuddy.com/?left=pH-calculation&right=bronsted-lowry-theory

 

[LegitSci]

i understand the equation but I am not sure how to determine H30 concentration and HA- Concentration with just the acid dissociation constant for hydrofluoric acid

 

[Borek]

im not sure how to determine H30 concentration and HA- Concentration

HA^- or A^-?

Besides, just dissociation constant is not enough. You also need to know analytical (AKA total or formal) concentration of the acid. Then it is just a problem of finding pH of a solution of a weak acid, plenty of sites explaining how to do that (including the one I already linked to, just choose appropriate page using menu on the left).