RAJASTHAN PMT Rajasthan - PMT Solved Paper-2004

  • question_answer
    In a buffer, if the ratio of salt and acid is increased 10 times, then pH will:

    A)  increase by 10

    B)  decrease by 10

    C)  increase by one

    D)  decrease by one

    Correct Answer: C

    Solution :

    From Handersons equation: \[pH{{=}_{P}}{{K}_{a}}+\log \frac{[Salt]}{[acid]}\] Hence, on increasing [salt]/[acid] by ten times pH will increase by one. (As, \[\log \frac{[Salt]}{[acid]}\] will be equal to \[log\text{ }10\]i.e., one)


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