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JIPMER Jipmer Medical Solved Paper-2000

  • question_answer
    The pH of a 0.01 M solution of a weak acid having degree of dissociation 12.5% is:

    A)  5.623                                   

    B)  2.903   

    C)         4.509                   

    D)         3.723

    Correct Answer: B

    Solution :

    \[[{{H}^{+}}]=\]molarity \[\times \] degree of dissociation \[=\frac{0.01\times 12.5}{100}=1.25\times {{10}^{-3}}\] We know that, \[pH=-\,\log \,[{{H}^{+}}]\] \[=-\,\log \,(1.25\times {{10}^{-3}})\] \[=-\,\log \,1.25+3\] \[=3-0.0970=2.9030\]


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