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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 a weak acid is 4.8. What should be the ratio of [Acid]/[Salt] of a buffer if \[pH=5.8\] is required                                                 [MP PET 2003]

    A)                 10          

    B)                 0.1

    C)                 1             

    D)                 2

    Correct Answer: B

    Solution :

               \[pH=p{{K}_{a}}+\text{log}\frac{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}\]                    \[5.8=4.8+\log \frac{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}\] or \[\text{log}\frac{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}=1.0\]                                          \[\frac{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}=\text{antilog}\,\,1.0=10\]                                  \                 \[\frac{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}=\frac{1}{10}=0.1\]


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