08-31-2007, 07:11 AM
The Pka of a protein is 4. At a Ph of 5, how much will be dissociated?
a. 10%
b.90%
c.50%
d. 100%
e.99%
a. 10%
b.90%
c.50%
d. 100%
e.99%
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biochem - lovelymorn
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08-31-2007, 07:13 AM
A patient takes aspirin daily. The Pka is 4. At a PH of 6, how much of it will be dissociated ?
a. 100% b.99% c.1% d.50% e.0%
08-31-2007, 07:23 AM
one way to remember
ph +pka +log B/A +2 - 99% +1 - 90% pka - x -1 - 10% -2 - 1%
08-31-2007, 07:26 AM
as far as I know these concepts are no more tested in USMLE...
08-31-2007, 07:31 AM
acids don`t dissociate in acidic media and same for bases..that`s enough to remember i guess.
08-31-2007, 07:33 AM
oops...didnt know they r not tested anymore...but they r asked in a different way i guess..like long questions n clinical scenarios getting down to this concept...anyways Happy studying..
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