Problem: 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. H2OH3O+HCNOH-CN-

FREE Expert Solution

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); K= 6.2 × 10–10


From this, we can construct an ICE table. Remember that liquids are ignored in the ICE table.

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Problem Details

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. 

H2O
H3O+
HCN
OH-
CN-

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