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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Self Evaluation Test - Equilibrium

  • question_answer
    At a certain temperature the dissociation constants of formic acid and acetic acid are \[1.8\times {{10}^{-4}}\] and \[1.8\times {{10}^{-6}}\] 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) 0.001 M          

    B) 0.01 M

    C) 0.1M                            

    D) 0.0001 M

    Correct Answer: B

    Solution :

    [b] \[[{{H}^{+}}]=\sqrt{C\times {{K}_{a}}}=\sqrt{0.001\times 1.8\times {{10}^{-4}}}\] for formic acid \[[{{H}^{+}}]=\sqrt{{{C}_{2}}\times 1.8\times {{10}^{-5}}}\] for acetic acid Equating and solving, \[{{C}_{2}}=0.01\,M.\]


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