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What is the pH of a 0.50m aqueous NaCN s...

What is the `pH` of a `0.50m` aqueous `NaCN` solution?

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`CH^(-) + H_(2)O rarr HCN + OH^(-)`
`K_(h) = 2 xx 10^(-5)`
`[OH^(-)] = sqrt(K_(h)C) = sqrt(2 xx 10^(-5) xx 0.5) = sqrt(10^(-5))`
pOH = 2.5 and pH = 11.5
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