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BCECE Medical BCECE Medical Solved Papers-2015

  • question_answer
    If the \[p{{K}_{a}}\] of a weak acid HA is 4.80 and the\[p{{K}_{b}}\] , of a weak base BOH is 4.78. Then, the pH of an aqueous solution of the corresponding salt, BA will be

    A)  8.23    

    B)  9.41    

    C)  7.01    

    D)  5.91

    Correct Answer: C

    Solution :

    \[BOH+HA\xrightarrow{{}}{{B}^{+}}+{{A}^{-}}+{{H}_{2}}O\]                 \[pH=\frac{1}{2}p{{K}_{w}}+\frac{1}{2}p{{K}_{a}}-\frac{1}{2}p{{K}_{b}}\] \[=\frac{1}{2}(14+4.80-4.78)=7.01\]


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