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The Ka of hydrocyanic acid, HCN, is 5.0*10-10. What is the pH of 0.050 M HCN...

The Ka of hydrocyanic acid, HCN, is 5.0*10-10. What is the pH of 0.050 M HCN (aq) ?

A. between 3.5 and 4.5

B. between 5.0 and 5.5

C. between 9.0 and 9.5

D. between 10.5 and 11.0

(The answer is B but please explain)

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