Problem 16.96


Based on their compositions and structures and on conjugate acid-base relationships, select the stronger base in each of the following pairs:

(a)NO3- or NO2-

Nitrate ion is the conjugate base of a strong acid; nitrous ion is the conjugate base of a weak acid, and therefore is a stronger base than nitrate ion.

(b) PO43- or AsO43-

Hmmm.. form the acids related to these anions, and go from there. P is more electronegative than As, H3PO4 is the stronger acid, and AsO43- is the stronger base.

(c) HCO3- or CO32-

Carbonate ion is the stronger base - the more negative the anion, the stronger the attraction for protons. Could you calculate Kb for both species and verify this?


If you have any questions or comments, reply to chapman@sou.edu
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Doug Chapman chapman@sou.edu 8/13/08