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

  • question_answer
    A buffer solution contains \[6.4\times {{10}^{-5}}\] of acetic acid and \[0.1\,\,M\] of sodium acetate. What will be its \[pH\], if \[p{{K}_{a}}\]of acetic acid is 4.75                                         [MP PMT 1996]

    A)                 4.00       

    B)                 4.75

    C)                 5.00       

    D)                 5.25

    Correct Answer: B

    Solution :

               \[pH=p{{K}_{a}}+\text{log}\frac{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}\];\[pH=4.75+\text{log}\frac{0.1}{0.1}\]                                 \[pH=4.75+\text{log}\,\,1\];\[pH=4.75\]


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