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

  • question_answer
    What will be the \[pH\]value of 0.05 M \[Ba{{(OH)}_{2}}\]solution [CPMT 2004]

    A)                 12          

    B)                 13

    C)                 1             

    D)                 12.96

    Correct Answer: B

    Solution :

               \[Ba{{(OH)}_{2}}\ \to \ \underset{.05M}{\mathop{B{{a}^{+2}}}}\,+\underset{2\times 0.5M}{\mathop{2O{{H}^{-}}}}\,\]                    \[pOH=\log \frac{1}{{{[OH]}^{-}}}=\log \frac{1}{.1}=1\]                                 \[pH+pOH=14\]; \[pH+1=14\]; \[pH=14-1=13\]


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