Posted by rodrigue on Friday, February 19, 2010 at 7:47pm.
HCOOH ==> H^+ + HCOO^-
Ka = (H^+)(HCOO^-)/(HCOOH) = 1.7 x 10^-4
Convert pH = 3.74 to (H^+). Substitute for (H^+) and (HCOO^-) (they will be the same). For (HCOOH), substitute X-(H^+). Solve for X.
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