A) 7.3020
B) 5.3020
C) 6.3010
D) 6.6990
Correct Answer: C
Solution :
The solution of HCN and KCN is an acidic Buffer solution. Hence, from Hendarsons equation: \[pH=-\log \,{{K}_{a}}+\log \frac{[Salt]}{[Acid]}\] \[=-\log \,(5\times {{10}^{-8}})+\log \frac{0.15\text{/}0.5}{1.5\text{/}0.5}\] \[=-\log 5-\log {{10}^{-8}}+\log \frac{1}{10}\] \[=-\,0.6990+8+(-1)\] \[=6.3010\]You need to login to perform this action.
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