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The K_(a)value for HCN is 10^(-9) . What is the pH of 0.5 M HCN solution ? |
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Answer» SOLUTION :`K_(a)=10^(-9)` c=0.4 M` pH=-log[H^+]` `[H^+]=sqrt(k_axxc)` `=sqrt(10^(-9)xx0.4)` `=2XX10^(-5)` `THEREFORE pH=-log(2xx10^(-5))` `=5-log2` `=5-0.3010` `=4.699`. |
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