Pka and acidity

[Dental2000]

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How is pKa related to acidity?

I say the lower the pKa the more acidic the molecule??

not sure if its rite

 

[LetsGo2DSchool]

That's correct, the lower the pKa, the more acidic.

This is opposite of Ka: the higher the Ka, the more acidic.

Reason why is because pKa = - log Ka

Btw, p of anything = - log of something, (such as i.e. pH = - log [H+])

 

[bharat008]

How is pKa related to acidity?

I say the lower the pKa the more acidic the molecule??

not sure if its rite

true!!

 

[GSUeagle2011]

Right. pKa is the neg. log of Ka and is most commonly used for buffers and Henderson Haselbauch (pH = pKa + [A-]/[HA],. pH is the neg. log of the H+ concentration. The higher the Ka the stonger the acid, and therefore the lower the pKa the stronger the acid. Same goes for pKb and Kb. p just simply means the neg. log.

 

[Jab1113]

that's correct, the lower the pka, the more acidic.

This is opposite of ka: The higher the ka, the more acidic.

Reason why is because pka = - log ka

btw, p of anything = - log of something, (such as i.e. Ph = - log [h+])

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