Values for pKb and pKa

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Matt Sanruk 2H
Posts: 131
Joined: Wed Sep 18, 2019 12:21 am

Values for pKb and pKa

Postby Matt Sanruk 2H » Wed Jan 22, 2020 9:42 pm

If I calculate a pKb or a pKa and the answer is relatively low, does that mean I did the problem correctly? Or at least it's a good sign that its correct?

Daniel Honeychurch1C
Posts: 109
Joined: Thu Jul 11, 2019 12:15 am

Re: Values for pKb and pKa

Postby Daniel Honeychurch1C » Wed Jan 22, 2020 9:46 pm

I believe that pKa and pKb for weak acids/bases are typically between 3-7 but can be outside this range. This all depends on the acid/base.

Hailey Kim 4G
Posts: 110
Joined: Sat Jul 20, 2019 12:16 am

Re: Values for pKb and pKa

Postby Hailey Kim 4G » Wed Jan 22, 2020 9:58 pm

The lower the pKa, the stronger the acid. The lower the pKb, the stronger the base. An easy way to check to see if you have the correct values is to add pKa and pKb and make sure the sum is equal to 14.

Matthew Tsai 2H
Posts: 101
Joined: Wed Sep 18, 2019 12:20 am

Re: Values for pKb and pKa

Postby Matthew Tsai 2H » Thu Jan 23, 2020 12:20 am

Low pKa and low pH are generally associated with each other, while high pKa and high pH are also associated with each other. The same is true for pKb and pOH.


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