NEET Sample Paper NEET Sample Test Paper-51

  • question_answer 1.0 mole of HCl and 1.0 mole of \[C{{H}_{3}}COONa\]are dissolved in water and volume is made one litre. What should be the concentration of \[{{H}^{+}}\] in the solution. If \[{{K}_{a}}\] of \[C{{H}_{3}}COOH\] is \[1.6\,\,\times \,\,{{10}^{-}}^{5}\]

    A) \[1.6\times {{10}^{-}}^{5}\]               

    B) \[4\times {{10}^{-}}^{3}\]

    C) \[16\times {{10}^{-}}^{5}\]                

    D) \[4\times {{10}^{-}}^{2}\]

    Correct Answer: B

    Solution :

    \[HCl+C{{H}_{3}}COONa\,\,\to \,\,C{{H}_{3}}COOH+NaCl\] Initial    1      1       0       0 Final     0      0       1      - \[[{{H}^{+}}]\,\,=\,\,\sqrt{{{K}_{a}}\times C}\]


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