pKa vs Ka

Acidity
Basicity
The Conjugate Seesaw

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605208780
Posts: 50
Joined: Wed Sep 18, 2019 12:16 am

pKa vs Ka

Postby 605208780 » Tue Dec 03, 2019 12:22 pm

Why is pKa preffered over Ka?

105335337
Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

Re: pKa vs Ka

Postby 105335337 » Tue Dec 03, 2019 12:31 pm

Ka is the disassociation factor while pKa is the pH of the Ka factor. For example. If an acid has a pKa of 1.0x10^-7, the pKa will be 7.

605208780
Posts: 50
Joined: Wed Sep 18, 2019 12:16 am

Re: pKa vs Ka

Postby 605208780 » Tue Dec 03, 2019 1:01 pm

Okay I talked to someone about this question and I also found out that pKa is preferred it is the log version of the number and therefore easier to compare and use rather than the scientific powers of Ka

Jorge Ramirez_4H
Posts: 54
Joined: Wed Nov 21, 2018 12:19 am

Re: pKa vs Ka

Postby Jorge Ramirez_4H » Tue Dec 03, 2019 1:15 pm

Is Ka referring to a base or an acid?

Sophia Shaka 3L
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Joined: Wed Sep 18, 2019 12:20 am
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Re: pKa vs Ka

Postby Sophia Shaka 3L » Tue Dec 03, 2019 1:19 pm

Ka is the acid dissociation constant.
Also, this same logic is why pH is preferred over simply quantifying [H+].

Sanjana K - 2F
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Re: pKa vs Ka

Postby Sanjana K - 2F » Tue Dec 03, 2019 1:29 pm

For a very weak acid, the Ka can be an extremely small number, so to deal with such numbers, we use the pKa, which converts the Ka values to larger numbers we're more familiar with. It also allows for convenience with graphing.

BritneyP- 2c
Posts: 101
Joined: Sat Sep 14, 2019 12:15 am

Re: pKa vs Ka

Postby BritneyP- 2c » Tue Dec 03, 2019 1:43 pm

pKa is preferred because it is the log version of Ka, which is easier to compare than using Ka.


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