PKb --> pKa?

Question

How do i find pKa if given Kb?

I know that pKb = -logKb, is there a way to get pKa from pKb??

Thanks!

Answer 1

pKb + pKa = 14

pKa = 14 - pKb

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Answer 2

If you're working with pure water you can assume that Kw= 1.0 x 10^-14

Kw= Ka x Kb         therefore you can divide Kb into Kw and get Ka.

Then to get pKa, you take the -log(Ka)

Hope this helps!!

Answer 3

pKa=14-pKb