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NEET AIPMT SOLVED PAPER SCREENING 2010

  • question_answer
    In a buffer solution containing equal concentration of \[{{B}^{-}}\] and HB, the \[{{K}_{b}}\] for \[{{B}^{-}}\] is \[{{10}^{-10}}\] The pH of buffer solution is             

    A) 10          

    B)                        7                   

    C) 6                             

    D)        4                   

    Correct Answer: D

    Solution :

    Key Idea (i) For basic buffer \[pOH=p{{K}_{b}}+\log \frac{[salt]}{[base]}\]                 (ii)\[pH+pOH=14\] Given,       \[{{K}_{b}}=1\times {{10}^{-10}},[salt]=[base]\]                 \[pOH=-\log \,{{K}_{b}}+\log \frac{[salt]}{[base]}\] \[\therefore \]  \[pOH=-\log (1\times {{10}^{-10}})+\log 1\]                           \[=10\]                 \[pH+pOH=14\]                                 \[pH=14-10=4\]


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