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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2005

  • question_answer
    A buffer solution has equal volumes of 0.2 M \[N{{H}_{4}}OH\] and 0.02 M \[N{{H}_{4}}Cl\]. The \[p{{K}_{b}}\], of the base is 5. The pH is :

    A)  10                                         

    B)  9

    C)  4                                            

    D)  7

    Correct Answer: A

    Solution :

    \[pOH=p{{K}_{b}}+\log \frac{[salt]}{[base]}\]                                 (Hendersons equation)                 \[=5+\log \frac{0.02}{0.2}=5+\log \frac{1}{10}\]                 \[=5+(-1)=4\]                 \[pH=14-pOH=14-4=10\]


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