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KVPY Sample Paper KVPY Stream-SX Model Paper-6

  • question_answer
    A certain buffer solution contains equal concentration of \[{{\operatorname{X}}^{-}}\]and HX. The \[{{K}_{b}}\] for \[{{X}^{-}}\] is \[{{10}^{-10}}\]. The pH of the buffer is:

    A) 4                                 

    B) 7

    C) 10                                

    D) 14

    Correct Answer: A

    Solution :

    For a basic buffer \[pH=14-p{{K}_{b}}-\log \frac{[salt]}{[base]}\] \[pH=14-p{{K}_{b}}-\log \frac{[salt]}{[base]}\] \[=14-(-\log {{10}^{-10}})-\log 1\] \[\Rightarrow \]\[pH=4\]


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