I need a lil help again,
1. 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.
i know water cancels out, and H3O AND CNO- are equal to 0. After that I don't know what to do.