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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Hydrogenion concentration pH scale and buffer solution

  • question_answer
    Given pH of a solution A is 3 and it is mixed with another solution B having pH 2. If both mixed then resultant pH of the solution will be  [BHU 2005]

    A)                 3.2         

    B)                 1.9

    C)                 3.4         

    D)                 3.5

    Correct Answer: B

    Solution :

               pH of the solution A = 3                    [H+]A ­= 10?3 M.                    pH of the solution B = 2                    [H+]B =10?2 M                    [H+] = 10?3 + 10?2 = 10?3 + 10 ´ 10?3 = 11 ´ 10?3.                    pH = ? log(11 ´ 10?3) = 3 ? log 11                                 = 3 ? 1.04 = 1.95


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