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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Critical Thinking

  • question_answer
    The pH of pure water or neutral solution at \[50{}^\circ C\] is ?. \[(p{{K}_{w}}=13.26\]\[=13.26\] at \[50{}^\circ C)\] [Pb. PMT 2002; DPMT 2002]

    A)                 7.0         

    B)                 7.13

    C)                 6.0         

    D)                 6.63

    Correct Answer: D

    Solution :

               \[[{{H}^{+}}]\,[O{{H}^{-}}]\,={{10}^{-13.26}}\]            \[\therefore \] \[[{{H}^{+}}]\,=\,[O{{H}^{-}}],\] \[\therefore \] \[{{[{{H}^{+}}]}^{2}}={{10}^{-13.26}}\]            \[[{{H}^{+}}]={{10}^{\frac{-13.26}{2}}}\]                                 pH = 6.63.


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