2. Solved Papers
  3. CET Karnataka Medical

CET Karnataka Medical CET - Karnataka Medical Solved Paper-2005

  • question_answer
    A buffer solution has equal volumes of\[0.2M\text{ }N{{H}_{4}}OH\]and \[0.02M\,N{{H}_{4}}Cl\]The \[_{p}{{k}_{a}}\] of the base is 5. The pH is:

    A) \[10\]              

    B) \[9\]

    C) \[4\]               

    D) \[7\]

    Correct Answer: A

    Solution :

    \[pOH=p{{K}_{b}}+\log \frac{[salt]}{[base]}\]  (Hendersons equation) \[=5+\log \frac{0.02}{0.2}=5+\log \frac{1}{10}\] \[=5+(-1)=4\] \[pH=14-pOH=14-4=10\]


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