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

  • question_answer
    The \[pH\]of water at \[{{25}^{o}}C\] is nearly [CPMT 1986, 89, 90, 93; CBSE PMT 1989; MADT Bihar 1995]

    A)                 2             

    B)                 7

    C)                 10          

    D)                 12

    Correct Answer: B

    Solution :

               \[[{{H}^{+}}]=[O{{H}^{-}}]\]            \[{{K}_{w}}=[{{H}^{+}}]\,\,[O{{H}^{-}}]\]\[={{10}^{-14}}\]                                 \[\therefore \,[{{H}^{+}}]={{10}^{-7}}\], \[pH=-\log \,[{{H}^{+}}]=7\].


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