Evaluate Keq.?

Cyanic acid, HCNO, is a weak acid:
HCNO(aq) + H2O(l) -----> H3O+(aq) + CNO-(aq)
In a 0.20 M aqueous solution of HCNO, the concentration of H3O+ is measured to be 6.5E-3 M. Evaluate Keq.

Answer:
[products]/[reactants] = Keq

[6.5E-3]/0.2 = Keq = 0.0325
3.2 x 10^-8

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