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  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2001

  • question_answer
    If\[p{{K}_{w}}=13.36\]at\[50{}^\circ C,\]the pH of pure water at the same temperature is:

    A) 7.00                                       

    B) 6.68

    C) 7.63                       

    D)        6.00

    E) zero

    Correct Answer: B

    Solution :

    \[p{{K}_{w}}=13.36\] (temperature\[=50{}^\circ C\]) pH of water = ? (temperature\[=50{}^\circ C\]) \[p{{K}_{w}}=pH+pOH\] (for pure water \[pH=pOH\]) \[\therefore \] \[p{{K}_{w}}=2pH\] By putting the values \[13.36=2\times pH\]                 \[pH=\frac{13.36}{2}=6.68\]


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