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Johnathan Smith 1D
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Postby Johnathan Smith 1D » Sun Dec 01, 2019 8:38 pm

What is pKa and how do we find it?

ishaa Diwakar 4E
Posts: 56
Joined: Wed Sep 11, 2019 12:17 am

Re: pKa

Postby ishaa Diwakar 4E » Sun Dec 01, 2019 8:41 pm

pKa is the -log[Ka]. Similarly to pH, it is a simplified way of writing concentration using the -log equation as an operator. We don't need to know how to calculate pKa for this class.

Ariana Iranmahboub1G
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Re: pKa

Postby Ariana Iranmahboub1G » Sun Dec 01, 2019 8:42 pm

pKa is used to measure how strong an acid is. It is measured by taking the negative log of Ka(the equilibrium constant). The smaller the pKa is, the stronger the acid.
Last edited by Ariana Iranmahboub1G on Sun Dec 01, 2019 8:52 pm, edited 1 time in total.

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Re: pKa

Postby KDang_1D » Sun Dec 01, 2019 8:44 pm

"p" means to take the -log of a value. Just as pH is the -log[H+], pKa is the -log(Ka).

For example, NH4+ has a Ka = 5.6x10^-10
pKa = -log(5.6x10^-10) = 9.25

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