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

  • question_answer
    The \[p{{K}_{a}}\] of equimolecular sodium acetate and acetic acid mixture is 4.74. If \[pH\] is    [DPMT 2001]

    A)                 7             

    B)                 9.2

    C)                 4.74       

    D)                 14

    Correct Answer: C

    Solution :

               \[pH=p{{K}_{a}}+\text{log}\frac{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}\] equimolar means                                 \[\frac{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}=1\]; \[\]\[pH=4.74+0=4.74\]


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