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

  • question_answer
    What is the pH of 0.01 M glycine solution? For glycine, \[K{{a}_{1}}=4.5\times {{10}^{-3}}\]and \[K{{a}_{2}}=1.7\times {{10}^{-10}}\]at 298 K  [AIIMS 2004]

    A)                 3.0         

    B)                 10.0

    C)                 6.1         

    D)                 7.2

    Correct Answer: C

    Solution :

               \[K=K{{a}_{1}}\times K{{a}_{2}}\]\[=4.5\times {{10}^{-3}}\times 1.7\times {{10}^{10}}\]                    \[{{H}^{+}}=\sqrt{Kc}\] \[=\sqrt{4.5\times {{10}^{-3}}\times 1.7\times {{10}^{-10}}\times .01}\]                                 \[=.87\times {{10}^{-7}}\]                            \[pH=-\log \ 0.87\times {{10}^{-7}}\]\[=7-0.93=6.07\].


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