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

  • question_answer
    When 10 ml  of 0.1 M acetic acid \[(p{{K}_{a}}=5.0)\] is titrated against 10 ml of 0.1M ammonia solution \[(p{{K}_{b}}=5.0)\], the equivalence point occurs at pH          [AIIMS 2005]

    A)                 5.0         

    B)                 6.0

    C)                 7.0         

    D)                 9.0

    Correct Answer: C

    Solution :

               pKa = ? log Ku, pKb = ? log Kb                    pH = \[-\frac{1}{2}[\log {{K}_{a}}+\log {{K}_{w}}-\log {{K}_{b}}]\]                    \[=-\frac{1}{2}[-5+\log (1\times {{10}^{-14}})-(-5)]\]                                 \[=-\frac{1}{2}[-5-14+5]=-\frac{1}{2}(-14)=7\]


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