2. Questions Bank
  3. JEE Main & Advanced
  4. Chemistry
  5. Equilibrium / साम्यावस्था

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

  • question_answer
    The \[pH\]value of decinormal solution of \[N{{H}_{4}}OH\] which is 20% ionised, is        [CBSE PMT 1998]

    A)                 13.30    

    B)                 14.70

    C)                 12.30    

    D)                 12.95

    Correct Answer: C

    Solution :

               For \[N{{H}_{4}}OH\].                    \[[O{{H}^{-}}]=C\,.\,\alpha \] ; \[C=\frac{1}{10}M\],  \[\alpha =0.2\]                    \[[O{{H}^{-}}]=\frac{1}{10}\times 0.2=2\times {{10}^{-2}}\,M\]                    \[pOH=-\log \,\,[O{{H}^{-}}]\]\[=\log \,\,[2\times {{10}^{-2}}]\]; \[pOH=1.7\]                                 \[pH=14-pOH\] \[=14-1.7=12.30\].


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