A) 2.0
B) 4.7
C) 5.0
D) \[2\times {{10}^{-5}}\]
Correct Answer: C
Solution :
\[[{{H}^{+}}]\]ln a solution of weak acid of cone. C and dissociation constant\[{{K}_{a}}\]is given as: \[[{{H}^{+}}]=\sqrt{{{K}_{a}}\times C}=\sqrt{4.0\times {{10}^{-10}}\times 2.5\times {{10}^{-1}}}\] \[=\sqrt{1\times {{10}^{-10}}}\] \[=1\times {{10}^{-5}}M\] \[pH=-\log \,[{{H}^{+}}]=-log{{10}^{-5}}=5\]
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