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

  • question_answer
    The dissociation constant of an acid HA is \[1\times {{10}^{-5}}\]. The \[pH\] of 0.1 molar solution of the acid will be [KCET (Engg./Med.) 1999]

    A)                 Five       

    B)                 Four 

    C)                 Three   

    D)                 One

    Correct Answer: C

    Solution :

               \[HA\]⇌\[{{H}^{+}}+{{A}^{-}}\]                                                  \[[{{H}^{+}}]=0.1\,\,M\]; \[{{[{{H}^{+}}]}^{2}}={{K}_{a}}\times C\]                    \[[{{H}^{+}}]=\sqrt{{{K}_{a}}\times C}=\sqrt{1\times {{10}^{-5}}\times 0.1}=\sqrt{{{10}^{-6}}}\]                                 \[[{{H}^{+}}]={{10}^{-3}}M;\,\,pH=3\]


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