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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Self Evaluation Test - Equilibrium

  • question_answer
    A buffer solution is prepared by mixing 10 mL of  \[1.0M\,C{{H}_{3}}COOH\] and 20 mL of 0.5 M \[C{{H}_{3}}COONa\] and then diluted to 100 mL with distilled water. If \[p{{K}_{a}}\]of \[C{{H}_{3}}COOH\] is 4.76, what is the pH of the buffer solution?

    A) 5.8                   

    B) 4.34  

    C) 5.21                 

    D) 4.76

    Correct Answer: D

    Solution :

    [d] Total volume \[=100\text{ }mL\] \[\left[ acid \right]=10mL\times \frac{1.0}{100}=0.1\] \[\left[ salt \right]=20mL\times \frac{0.5}{100}=0.1\] pH of acidic buffer \[=p{{K}_{a}}+\log \frac{[salt]}{[acid]}\] \[=4.76+log\frac{0.1}{0.1}=4.76\]


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