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  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2009

  • question_answer
    At a certain temperature, the dissociation constants of formic acid and acetic acid are \[1.8\times {{10}^{-4}}\]and\[1.8\times {{10}^{-5}}\]respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in 0.001 M formic acid solution is equal to

    A) 0.01 M                 

    B) 0.001 M

    C) 0.1 M                    

    D)        0.0001 M

    E) 0.1010 M

    Correct Answer: A

    Solution :

    \[[{{H}^{+}}]={{K}_{a}}.C\] Given,   \[{{[{{H}^{+}}]}_{HCOOH}}={{[{{H}^{+}}]}_{C{{H}_{3}}COOH}}\]                 \[{{K}_{a}}.C=K_{a}^{}C\] \[\Rightarrow \] \[1.8\times {{10}^{-4}}\times 0.001=1.8\times {{10}^{-5}}\times C\] \[\therefore \]  \[C=0.01\,M\]


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