Posted by Henry on Sunday, April 22, 2012 at 3:44pm.
Weak acids don't ionize completely.
HCOOH ==> H^+ + HCOO^- for which
Ka = (H^+)(HCOO^-)/(HCOOH)
There are no unit for Ka. If you use molarity for concn, as most do, there appears to be "formal" units but in higher chemistry courses you will learn there are no units since the numbers that go in are activities and they have no units.
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