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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Critical Thinking

  • question_answer
    For a weak acid \[HA\] with dissociation constant  \[{{10}^{-9}},\,\,pOH\] of its 0.1 M solution is                 [CBSE PMT 1989]

    A)                 9             

    B)                 3

    C)                 11          

    D)                 10

    Correct Answer: D

    Solution :

               Dissociation constant of \[HA={{10}^{-9}}\]                    \[HA\]⇌\[{{H}^{+}}+{{A}^{-}}\]                    \[[{{H}^{+}}]=\sqrt{\frac{{{K}_{a}}}{C}}\] \[=\sqrt{\frac{{{10}^{-9}}}{0.1}}\] ; \[[{{H}^{+}}]={{10}^{-4}}\]                    \[\therefore \,pH=4\]                    \[\because \,pH+pOH=14\]                                 \[pOH=14-pH\]\[=14-4\] ; \[pOH=10\]


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