2. Solved Papers
  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2008

  • question_answer
    A buffer solution is obtained on adding 10 mL \[1.0\text{ }M\,C{{H}_{3}}COOH\]and 20 mL 0.5\[0.5\text{ }M\,C{{H}_{3}}COONa\]. It is diluted to 100 mL by distilled water. If\[p{{K}_{a}}=4.76\]for\[C{{H}_{3}}COOH,\]then the pH value of buffer solution

    A)  2.76              

    B)  3.76

    C)  4.76              

    D)  0.76

    Correct Answer: C

    Solution :

     10 mL \[1.0\,M\,C{{H}_{3}}COOH\equiv 10N\,C{{H}_{3}}COOH\] 20 mL\[0.5M\,C{{H}_{3}}COONa\equiv 10\,N\,C{{H}_{3}}COONa\] \[pH=p{{K}_{a}}+\log \frac{[Salt]}{[Acid]}\] \[=4.76+\log \frac{[10]}{[10]}\] \[=4.76\]


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