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acid base question?
http://en.wikipedia.org/wiki/Henderson-Hasselbalch_equation
the equation on wikipedia is
ph = pKa + log (Base/Acid)
and
ph = pKa + log (A/HA)
but the one in my OCR notes is
ph = pka - log (HA/A)
and
ph = pka - log (Acid/Base)
both the ones on wikipedia are fine to use, as well as the ones we learnt in class?
the equation on wikipedia is
ph = pKa + log (Base/Acid)
and
ph = pKa + log (A/HA)
but the one in my OCR notes is
ph = pka - log (HA/A)
and
ph = pka - log (Acid/Base)
both the ones on wikipedia are fine to use, as well as the ones we learnt in class?
Learn the derivation and you won't get mixed up.
Ka = [H+][A-]/[HA]
therefore [H+] = Ka[HA]/[A-]
take logs throughout
log[H+] = logKa + log([HA]/[A-])
now change signs throughout
pH = pKa - log([HA]/[A-])
Ka = [H+][A-]/[HA]
therefore [H+] = Ka[HA]/[A-]
take logs throughout
log[H+] = logKa + log([HA]/[A-])
now change signs throughout
pH = pKa - log([HA]/[A-])
Thanks!
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