Given that the concentration of HCN is 0.135 M and the Ka value for HCN is 6.2 x 10^-10, we can calculate the concentration of CN- ions using the formula for the ionization of a weak acid:
\[ [CN^-] = \sqrt{Ka \times [HCN]} \]
\[ [CN^-] = \sqrt{6.2 \times 10^{-10}
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