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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Self Evaluation Test - Equilibrium

  • question_answer
    What is the pH of a \[{{10}^{-4}}M\,O{{H}^{-}}\] solution at 330K, if \[{{K}_{w}}\] at 330K is \[{{10}^{-13.6}}\]?

    A) 4                     

    B) 9.0   

    C) 10                    

    D) 9.6

    Correct Answer: D

    Solution :

    [d] Given at 330 K \[{{K}_{w}}={{10}^{-13.6}}\] i.e.  \[p{{K}_{w}}=pH+pOH\] \[\therefore \text{ }pOH=-log\left[ O{{H}^{-}} \right]\] \[13.6=pH+pOH\] \[pOH=-log{{10}^{-4}}\] \[pOH=4\] \[\therefore pH=13.6-4=9.6\]


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