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J & K CET Medical J & K - CET Medical Solved Paper-2004

  • question_answer
    The pH of a buffer solution of\[0.1\text{ }M\text{ }N{{H}_{4}}OH\] \[[p{{K}_{b}}=5.0]\]and\[0.01\text{ }M\text{ }N{{H}_{4}}Cl\]is:

    A)  1                                            

    B)  4

    C)  10                                         

    D)  13

    Correct Answer: C

    Solution :

                    \[pOH=p{{K}_{b}}+\log \frac{[Salt]}{[Base]}\] \[=5+\log \frac{0.01}{0.1}\] \[pOH=5-1\] \[pOH=4\] \[pH+pOH=14\] \[pH=14-pOH\] \[=14-4\] \[pH=10\]


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