CHEMISTRY> HELP QUICK! pls

i have an exam friday and cant figure this question out!
What is the pH of a 2.62 x 10 -1 M HCN solution ? NB the pKa for HCN = 9.212.

4.90
9.21
0.58
11.32
13.42

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asked by Lucinda
  1. See above.

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    posted by DrBob222

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