Posted by Dan on Saturday, April 28, 2012 at 5:49pm.
Ascorbic acid is a weak acid and ionizes partially. HI is a strong acid and ionizes 100%. The following is NOT the way it ionizes but it is a shortcut that can be used under some circumstances. This is one of them. To keep typing down I'll call ascorbic acid simply H2Asc
H2Asc ==> 2H^+ + Asc^2-
k1*k2 = (H^+)^2(Asc^2-)/(H2Asc)
You know H^+ from the HI (0.194 M) and you know H2Asc (0.167 M), look up k1 and k2 and solve for (Asc^2-).
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