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NEET Sample Paper NEET Sample Test Paper-88

  • question_answer
    The\[p{{K}_{a}}\]of an amino acid is 9.15. At what pH amino acid is 5% dissociated?

    A) 9.15                 

    B)        4.85

    C) 9.44                 

    D)        7.87

    Correct Answer: D

    Solution :

    [d] Amino acid is 5% dissociated. Thus, \[[{{A}^{-}}]=\] [conjugate base] \[=0.05\] [HA] = [Amino acid] = 0.95 \[pH=p{{K}_{a}}+\log \frac{[{{A}^{+}}]}{[HA]}\] \[=9.15+\log \left( \frac{0.05}{0.95} \right)=7.87\]


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