PKa

[IdahoDoc]

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Could someone tell me the relationship between PKa and PH? I always get these mixed up.

 

[Albuterol]

pH= -log [H+] where H+ is the hydrogen ion concentration
pKa= -log [Ka] where Ka is the acid dissociaton constant Ka= [H+][A-]/[HA]

henderson-hasselbalch equation
pH= pKa + log (conj. base/weak acid)

 

[nixon13]

pH=pKa at equivalence pt.