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

  • question_answer
    The dissociation constant of HCN is \[5\times {{10}^{-10}}\]. The \[pH\] of the solution prepared by mixing 1.5 mole of HCN and 0.15 moles of KCN in water and making up the total volume to \[0.5\,d{{m}^{3}}\] is                                               [JIPMER 2001]

    A)                 7.302    

    B)                 9.302

    C)                 8.302    

    D)                 10.302

    Correct Answer: C

    Solution :

               \[pH=-\log \,\,{{K}_{a}}+\log \frac{[KCN]}{[HCN]}\]                                 \[pH=-\log \,[5\times {{10}^{-10}}]+\log \left( \frac{0.15}{1.5} \right)=8.302\]


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