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

  • question_answer
    \[50\,\,ml\] water is added to a \[50\,\,ml\] solution of \[Ba{{(OH)}_{2}}\] of strength \[0.01\,\,M.\] The \[pH\] value of the resulting solution will be               [MP PMT 1999]

    A)                 8             

    B)                 10

    C)                 12          

    D)                 6

    Correct Answer: C

    Solution :

               0.01 M \[Ba{{(OH)}_{2}}=0.02N\,\,Ba{{(OH)}_{2}}\]                    \[{{N}_{1}}{{V}_{1}}={{N}_{2}}{{V}_{2}}\]                    \[[0.02N]\times [50\,\,ml]={{N}_{2}}\times 100\,\,ml\]                    \[{{N}_{2}}=\frac{0.02\times 50}{100}\]\[={{10}^{-2}}N\]; \[[O{{H}^{-}}]={{10}^{-2}}\]N                                 \[pOH=2\] or \[pH=12\]


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