pKa and pKb

Acidity
Basicity
The Conjugate Seesaw

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1K Kevin
Posts: 47
Joined: Fri Sep 28, 2018 12:24 am

pKa and pKb

Postby 1K Kevin » Thu Jan 17, 2019 10:41 am

I'm getting a bit confused but what does a high pKa mean in comparison to a low pKa, and same with pKb. I know that a low pKa means a high pKb but would that be a stronger acid/weak base or a stronger base/weak acid.

Chem_Mod
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Joined: Thu Aug 04, 2011 1:53 pm
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Re: pKa and pKb

Postby Chem_Mod » Thu Jan 17, 2019 10:50 am

A lower pKa value indicates a stronger acid. That is, the lower value indicates the acid more fully dissociates in water.

Kobe_Wright
Posts: 83
Joined: Fri Sep 28, 2018 12:16 am

Re: pKa and pKb

Postby Kobe_Wright » Thu Jan 17, 2019 11:26 am

Remember that on the pH scale Acid is a lower number so when you have a low Pka that means its a strong acid.

Ashley Zhu 1A
Posts: 69
Joined: Fri Sep 28, 2018 12:16 am

Re: pKa and pKb

Postby Ashley Zhu 1A » Thu Jan 17, 2019 11:46 am

the same trend also applies for pKb: the lower the pKb, the stronger the base

Henry Dudley 1G
Posts: 61
Joined: Fri Sep 28, 2018 12:16 am

Re: pKa and pKb

Postby Henry Dudley 1G » Sat Jan 19, 2019 4:44 pm

High pKa= weak acid/strong base
Low pKa= strong acid/weak base

High pKb= weak base/strong acid
Low pKb= strong base/weak acid


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