$A$ buffer solution is prepared by mixing $0.01 \ M$ $HCN$ and $0.02 \ M$ $NaCN$. If $K_{a}$ for $HCN$ is $6.6 \times 10^{-10}$,what is the concentration of $H^{+}$ ions in the solution?
- A$3.3 \times 10^{-6} \ M$
- B$3.3 \times 10^{-10} \ M$
- C$1.32 \times 10^{-6} \ M$
- D$1.32 \times 10^{-10} \ M$
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