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

  • question_answer
    Components of buffer solution are \[0.1\,M\,HCN\] and \[0.2\,M\,NaCN\]. What is the pH of the solution           [RPET 2000]

    A)                 9.61       

    B)                 6.15

    C)                 2.0         

    D)                 4.2

    Correct Answer: A

    Solution :

               pH = p\[{{K}_{a}}\] + log\[\left[ \frac{\text{salt}}{\text{acid}} \right]\]                  = \[9.30\] + log \[\left[ \frac{0.2}{0.1} \right]\] = 9.30 + 0.3010 = 9.6.


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