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

  • question_answer
    The concentration of hydronium \[({{H}_{3}}{{O}^{+}})\] ion in water is [CET Pune 1998]

    A)                 Zero      

    B)                 \[1\times {{10}^{7}}\,gm\,\,ion/litre\]

    C)                 \[1\times {{10}^{-14}}\,gm\,\,ion/litre\]               

    D)                 \[1\times {{10}^{-7}}\,gm\,\,ion/litre\]

    Correct Answer: D

    Solution :

               \[{{H}_{3}}{{O}^{+}}\] ⇌ \[O{{H}^{-}}+{{H}_{2}}\]                    \[pOH+pH=14\] ; \[7+7=14\]; \[[{{H}^{+}}]+[O{{H}^{-}}]={{10}^{-14}}\]                                 \[{{10}^{-7}}+{{10}^{-7}}={{10}^{-14}}\]; \[[O{{H}^{-}}]={{10}^{-7}}\]gm ion/l.


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