HCN is a weak acid. Remember that weak acids partially dissociate in water and that acids donate H+ to the base (water in this case). The dissociation of HCN is as follows:
HCN(aq) + H2O(l) ⇌ H3O+(aq) + CN–(aq); Ka = 6.2 × 10–10
From this, we can construct an ICE table. Remember that liquids are ignored in the ICE table.
In a 1.0 x 10-4 M solution of HCN(aq), identify the relative molar amounts of these species. Arrange from most to least.
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