7/25/2019 Formula Henderson Hasselbalch

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Difuziunea pasiva. pH-partitiaFormula Henderson-Hasselbalch

ACIZI

AH A-+ H+

Ka=][

]][[

AH

HA +

][

][

A

AH

=Ka

H ][ +

log][][

A

AH

= log [H+] log Ka

pH = - log H!"

p#a = - log #a

log][

][

A

AH

= pKa pH

C$nd p#a= pH %

log][

][

A

AH

= 0

[AH] = [A-]

&AZ'

B + H+ BH+

Ka=][

]][[+

+

BH

HB

][ +

BH

B

=][

+

H

Ka

log][

+

BHB = log Ka log [H

+]

log][ +BH

B

= pH p Ka

log][

+

BH

B

= 0

[B] = [BH+]