5D.5 in 7th Ed

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Henry Krasner 1C
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Joined: Thu Sep 27, 2018 11:15 pm

5D.5 in 7th Ed

Postby Henry Krasner 1C » Sun Jan 20, 2019 2:57 pm

How does one get the Kb from the pKa being 8.21.
The solution manual says it should be 1.8 x 10^(-5), but I continue getting 1.6 x 10^(-6).
What is the process for getting this number?

Posts: 50
Joined: Thu Sep 27, 2018 11:24 pm

Re: 5D.5 in 7th Ed

Postby amogha_koka3I » Sun Jan 20, 2019 4:06 pm

I believe to get Ka you need to do 10^(-pka).
Once you get the value for Ka, you divide 14 (KW) by the Ka in order to get Kb.
If this is giving you the wrong answer you can also try this:
14-pka=pkb. Then do 10^(-pkb) in order to get the Kb value. Essentially both ways should get you the same answer I believe.

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