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what is the relationship between acid strength and acid dissociation constant and its pKa value?

sofargone

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Posts: 10

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11 years ago

what is the relationship between acid strength and acid dissociation constant and its pKa value?

what is the similarities between them

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linasen

wrote...

#1

11 years ago

as an acid gets weaker, its Ka gets smaller & its pKa gets larger
ie
acetic acid has a Ka = 1.8 e-5 whose pKa is 4.74

a weaker acid like HCN has a Ka of 4.9 e-10, whose pKa = 9.30

================================

weak acids have small Ka's to X 10^- something

the p of that K is essentially that exponent with the sign changed

so the have smalll K's & large pKa 's

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