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What is the pH of a solution prepared by mixing 500mL of 2.0M HCN (Ka= 4.9x10^-10) with 500mL of 1.0 M KOH?

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HCN + KOH ==> KCN + H2O
mols HCN = ?
mols KOH = ?
How much HCN formed?
How much HCN left over.

Use the Henderson-Hasselbalch equation to solve for pH.
Post your work if you get stuck.

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