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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2001

  • question_answer
    For a buffer solution of\[C{{H}_{3}}COOH\]and \[C{{H}_{3}}COONa\]if\[[C{{H}_{3}}COOH],[C{{H}_{3}}COONa]=1\] and\[p{{K}_{a}}=4.74\]the pH value of the solution will be

    A)  5.74              

    B)  6.74

    C)  3.74              

    D)  4.74

    Correct Answer: B

    Solution :

     \[pH=p{{K}_{a}}+\log \frac{[salt]}{[acid]}\] \[=4.74+log\frac{1}{1}\] \[=4.74\]


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