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Homework Help: Solubility combined with Buffer solutions ugh

  1. Mar 9, 2007 #1
    1. The problem statement, all variables and given/known data
    Calculate the solubility of C6H5COOAg(s) in a buffer solution that has a pH of 3.20. (Ka = 6,5 x10^-5M ; Ksp = 2,5 x10^-5M^2)
    a) 0,0164M
    b) 0,0050M
    c) 0,0287M
    d) 0,0012M


    2. Relevant equations

    Henderson-Hasselbach, Ksp equation

    3. The attempt at a solution

    This is driving me nuts. I used Henderson-Hasselbach to find [C6H5COO], wrong answer, tried an equilibrium problem, wrong answer. Can someone give me a method for this. Thanks.
     
  2. jcsd
  3. Mar 9, 2007 #2
    could you illustrate your workings, maybe there is a calculation error or a way you used your equations wrongly
     
  4. Mar 10, 2007 #3

    Borek

    User Avatar

    Staff: Mentor

    What is your buffer concentration? Knowing pH you can only calculate acid/base ratio, not their real concentrations.
     
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