Homework Help: Chemistry

Posted by Andrea on Sunday, May 13, 2012 at 9:33pm.

The equilibrium constant for the following reaction is 7.2 x 10-10. What is the [H+] in a solution 1.0 M of this acid?
HCN + H2O --> H3O+ + CN-

Chemistry - DrBob222, Sunday, May 13, 2012 at 9:45pm
..........HCN + H2O ==> H3O^+ + CN^-
initial...1.0M...........0.......0
change.....-x............x.......x
equil.....1.0-x..........x.......x

Substitute into the Ka expression and solve for H3O^+.

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