A) 2
B) 4
C) 6
D) 10
Correct Answer: A
Solution :
\[[{{H}^{+}}]\,\,=\,\,\sqrt{C{{K}_{a}}}\,\,=\,\,\sqrt{0.5\times 0.2\times 1{{0}^{-\,4}}}=\,\,\sqrt{1.0}\times 1{{0}^{-\,2}}\] \[\left[ {{H}^{+}} \right]=1{{0}^{-}}^{2}\] \[pH =-log\left[ {{H}^{+}} \right]=-log\left( 1{{0}^{-}}^{2} \right)=+2\]You need to login to perform this action.
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