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Haryana PMT Haryana PMT Solved Paper-2008

  • question_answer
    What is the pH at equivalence point in the titration of  \[0.1M\,\,\,C{{H}_{3}}COOH\]and \[0.1M\]\[NaOH\]? (\[{{K}_{a}}\] for acetic acid is\[1.8\times {{10}^{-5}}\])

    A)  7              

    B)  Between 7 and 8

    C)  Between 8 and 9

    D)  Between 6 and 7

    Correct Answer: C

    Solution :

                    For weak acid and strong base, \[pH=7+\frac{1}{2}p{{K}_{a}}+\frac{1}{2}\operatorname{logC}\] \[=7+\frac{4.74}{2}+\frac{1}{2}\log \,{{10}^{-1}}\]


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