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college cemistry

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What is the pH for the solution made from 11.10 mL of 0.278 M HCl solution mixed with 70.90 mL of 0.1300 M ammonia solution ? Note that the pKa for NH4+ is 9.241

8.94
9.24
8.77
9.72
9.54

  • college cemistry - ,

    Hi Lucinda:

    This is a buffer:

    pH = pKa + log [base] / [acid]

    pH = 9.241 + log [70.90 x 0.1300] /
    [ 11.10 x 0.278]

    = 9.72

    For future questions, I can be reached at

    (559) 709-2022

    or

    zdarakjian

    atgmail

    dotcom

    Thank you

    Zareh Darakjian, Ph.D.

    University of California

    Researcher, Instructor, Tutor

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