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Punjab Medical Punjab - MET Solved Paper-2006

  • question_answer
    The \[p{{K}_{b}}\] value of \[N{{H}_{3}}\] is 5. Calculate the \[pH\] of the buffer solution, \[1\,\,L\] of which contains\[0.01\,\,M\,\,N{{H}_{4}}Cl\]and\[0.10\,\,M\,\,N{{H}_{4}}OH\]:

    A)  4                                            

    B)  6

    C)  8                                            

    D)  10

    Correct Answer: D

    Solution :

    \[pOH=p{{K}_{b}}+\log \frac{[salt]}{[base]}\] Given:   \[p{{K}_{b}}=5,\,\,[base]=0.10M\] \[[salt]=0.01\,\,M\] \[\therefore \]  \[pOH=5+\log \frac{0.01}{0.10}=4\]                 \[pH+pOH=14\] \[\therefore \]  \[pH=14-4=10\]


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