A) \[3.1\times {{10}^{10}}\]
B) \[6.2\times {{10}^{5}}\]
C) \[6.2\times {{10}^{-10}}\]
D) \[3.1\times {{10}^{-10}}\]
Correct Answer: D
Solution :
\[{{K}_{a}}=\frac{[{{H}^{+}}]\,\,[C{{N}^{-}}]}{[HC{{N}^{-}}]}\] \[6.2\times {{10}^{-10}}=\frac{[{{H}^{+}}]\,\,[0.02]}{[0.01]}\] \[[{{H}^{+}}]=\frac{6.2\times {{10}^{-10}}\times 0.01}{0.02}=3.1\times {{10}^{-10}}\]You need to login to perform this action.
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