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

  • question_answer
    \[{{10}^{-6}}M\,\,HCl\] is diluted to 100 times. Its \[pH\]is [CPMT 1984]

    A)                 6.0         

    B)                 8.0

    C)                 6.95

    D)                 9.5

    Correct Answer: C

    Solution :

               \[{{10}^{-6}}\,M\,HCl={{10}^{-8}}M\,[{{H}^{+}}]\]. Also from \[{{H}_{2}}O\]                    \[[{{H}^{+}}]={{10}^{-7}}M\]                    Total \[[{{H}^{+}}]={{10}^{-7}}+{{10}^{-8}}={{10}^{-7}}[1+0.1]\]\[={{10}^{-7}}[1.1]\]                                 Hence \[pH=7-0.0414=6.96\].


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