pKa values

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Jennifer Guzman 4C
Posts: 38
Joined: Wed Feb 14, 2018 3:01 am

pKa values

Postby Jennifer Guzman 4C » Sun Jan 27, 2019 3:29 pm

Where can I find an index of pKa values?

Cole Doolittle 2K
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

Re: pKa values

Postby Cole Doolittle 2K » Sun Jan 27, 2019 3:31 pm

I'm not sure if there is an index of these values. They should be given to you by problem or the problem may tell you to look at a table to find the pKa or Ka values. Also if you are given the Ka you know the pKa and vice versa.

Jonathan Pai 2I
Posts: 121
Joined: Fri Sep 28, 2018 12:27 am

Re: pKa values

Postby Jonathan Pai 2I » Sun Jan 27, 2019 3:39 pm

A table will be given in the book. Sometimes though it will give us the K value for the conjugate base/acid, so we would need to manipulate Kw=Ka*Kb.

hazelyang2E
Posts: 57
Joined: Fri Sep 28, 2018 12:23 am

Re: pKa values

Postby hazelyang2E » Sun Jan 27, 2019 4:32 pm

Tables 12.1 and 12.2 in the textbook (6th edition) list the pKa and Ka for common acids and the pKb and Kb of common bases. In addition, many problems will give you either the pKa, Ka, pKb, and Kb which you can then use to figure out the other three values, using
1.00 x 10^-14 = Kw = Ka x Kb, pKa = -logKa, and pKb = -logKb.


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