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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Hydrogenion concentration pH scale and buffer solution

  • question_answer
    The pH of 0.1 M acetic acid is 3, the dissociation constant of acid will be

    A)                 \[1.0\times {{10}^{-4}}\]              

    B)                 \[1.0\times {{10}^{-5}}\]

    C)                 \[1.0\times {{10}^{-3}}\]              

    D)                 \[1.0\times {{10}^{-8}}\]

    Correct Answer: B

    Solution :

               \[pH=3\], \[[{{H}^{+}}]={{10}^{-3}}M\]            \[\because [{{H}^{+}}]=\sqrt{K\times c}\]                 \[{{[{{10}^{-3}}]}^{2}}=K\times c\] ; \[\frac{[{{10}^{-6}}]}{0.1}=K={{10}^{-5}}\]


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