2. Solved Papers
  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2009

  • question_answer
    The pH of 0.1 M aqueous ammonia \[({{K}_{b}}=1.8\times {{10}^{-5}})\]is.

    A)  9.13               

    B)  10.13

    C)  11.13             

    D)  12.13

    Correct Answer: C

    Solution :

     The aqueous solution of ammonia is basic in nature. \[\therefore \] \[[O{{H}^{-}}]=\sqrt{{{K}_{b}}\times C}\] \[=\sqrt{1.8\times {{10}^{-5}}}\times 0.1\] \[=1.341\times {{10}^{-3}}\] \[pOH=-\log [O{{H}^{-}}]\] \[=-\log [1.341\times {{10}^{-3}}]\] \[=2.87\] \[pH=14-pOH\] \[=14-2.87=11.13\]


You need to login to perform this action.
You will be redirected in 3 sec spinner