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AIIMS AIIMS Solved Paper-2010

  • question_answer
    The pH of the mixture obtained when equal volumes of   \[N/10\text{ }NaOH\] and \[N/20\text{ }HCl\] are mixed, is

    A) \[1.6\]                                  

    B) \[12.4\]

    C)        \[13.4\]               

    D)        \[10.8\]

    Correct Answer: B

    Solution :

    Concentration of mixture mill equivalents of \[NaOH\] \[=\frac{-milliequivalents\,of\,HCl}{total\,volume}\] \[=\frac{V\times \frac{1}{10}-V\frac{1}{20}}{(V+V)}\] \[=\frac{V(0.1-0.05)}{2V}\] \[=0.025\] Since, \[NaOH\] is in excess, \[[O{{H}^{-}}]=0.025\] \[pOH=1.6\] \[pH=14-1.6=12.4\]


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