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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Hydrogenion concentration pH scale and buffer solution

  • question_answer
    What is the \[pH\]of \[Ba{{(OH)}_{2}}\]if normality is 10 [CPMT 1996]

    A)                 4             

    B)                 10

    C)                 7             

    D)                 9

    Correct Answer: B

    Solution :

               \[Ba{{(OH)}_{2}}\] ⇌ \[B{{a}^{2+}}+2O{{H}^{-}}\]                    One molecule on dissociation furnishes \[2O{{H}^{-}}\] ions.                    So, \[[O{{H}^{-}}]=2\times {{10}^{-4}}N\]                    \[N=M\times 2\] ;  \[M=\frac{N}{2}=\frac{2\times {{10}^{-4}}}{2}={{10}^{-4}}\]                    pOH \[=-\log [O{{H}^{-}}]=-\log (1\times {{10}^{-4}})=-4\]                                  \[pH+pOH=14\]; \[pH=14-4=10\].


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