"Find the pH of .50M sodium butanoate. Calculate the fraction of association." I found the pH,...

Question

Question

"Find the pH of .50M sodium butanoate. Calculate the fraction of association." I found the pH, how do you get the fraction of association?

Answer 1

Answer #1

Ans:

(Butanoate ion^-+H₂O« Butanoic acid +OH^-)

Calculate the fraction of association for sodium butanoate. (i.e., [Butanoic Acid]/[Sodium Butanoate])

a) [Sodium Butanoate]=0.50M.

fraction of association, Alpha=[Butanoic Acid]/0.50M,

{we know [HA]=[OH^-] from reaction stoichiometry (A^-+H₂O« HA+OH^-) }

therefore alpha=[OH^-]/0.50M

You can use your pH value to get [OH-] and then find fraction of association.

Answer 2

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