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

  • question_answer
    pH of a solution of \[10\,ml\]. 1N sodium acetate and \[50\,ml\] 2N acetic acid \[({{K}_{a}}=1.8\times {{10}^{-5}}),\] is approximately                                                                 [MP PMT 2003]

    A)                 4             

    B)                 5

    C)                 6             

    D)                 7

    Correct Answer: A

    Solution :

               \[pH=p{{K}_{a}}+\text{log}\frac{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}\]                    \[pH=-\log \,(1.8\times {{10}^{-5}})+\log \frac{[10]}{[100]}\]                    \[=-\log \,\,1.8+5+\log \,\,{{10}^{-1}}\]                                 \[=-\ 0.2553+5-1=3.7447\,\,\,\text{or}\,\,=4\]


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