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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Critical Thinking

  • question_answer
    What is the pH of a 1M \[C{{H}_{3}}COOH\]a solution \[{{K}_{a}}\] of acetic acid \[=1.8\times {{10}^{-5}}.\] \[K={{10}^{-14}}mo{{l}^{2}}litr{{e}^{-2}}\]                                            [DPMT 2002]

    A)                 9.4         

    B)                 4.8

    C)                 3.6         

    D)                 2.4

    Correct Answer: A

    Solution :

               \[C{{H}_{3}}CO{{O}^{-}}+{{H}_{2}}O\]⇌\[C{{H}_{3}}COOH+O{{H}^{-}}\]                    \\[[O{{H}^{-}}]=c\times h;\,\,\,\,h=\sqrt{\frac{{{K}_{w}}}{{{K}_{a}}}\times c}\]\[=\sqrt{\frac{{{10}^{-14}}}{1.8\times {{10}^{-5}}}\times 1}\]                    \[=2.35\times {{10}^{-5}}\]                                 \\[pOH=4.62\];  \[pH=9.38\approx 9.4\]


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