pka and ka

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405404782 Gabriel Rigole 4F
Posts: 56
Joined: Sat Aug 17, 2019 12:18 am

pka and ka

Postby 405404782 Gabriel Rigole 4F » Sun Dec 08, 2019 9:45 pm

What exactly are pKa and Ka and what are they used?

Ariana Iranmahboub1G
Posts: 114
Joined: Fri Aug 09, 2019 12:17 am

Re: pka and ka

Postby Ariana Iranmahboub1G » Sun Dec 08, 2019 9:49 pm

Ka is the acid dissociation constant and is used for weak acids and pka is the -log(Ka).

Kimberly Koo 2I
Posts: 99
Joined: Sat Aug 17, 2019 12:17 am

Re: pka and ka

Postby Kimberly Koo 2I » Sun Dec 08, 2019 9:54 pm

Both pKa and Ka are used for determining how acidic a molecule is

Posts: 100
Joined: Sat Aug 17, 2019 12:17 am

Re: pka and ka

Postby Jared_Yuge » Sun Dec 08, 2019 9:56 pm

Ka is the concentration of the product over the concentration of the reactant.

Serena Siddiq 3D
Posts: 51
Joined: Fri Aug 30, 2019 12:17 am

Re: pka and ka

Postby Serena Siddiq 3D » Mon Dec 09, 2019 3:18 am

Since kA represents the amount of H+ concentration at equilibrium for weak acids, it will be high if the acid has a high H+ and vice versa. The pkA is inversely related to this as it is the -log of this number (hence p in front) and would be lower if the weak acid was on the stronger side and vice versa. Therefore, stronger weak acid equals higher kA and lower pkA, weaker weak acid equals lower kA and higher pkA.

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