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Solubility combined with Buffer solutions ugh

  • #1
125
1

Homework Statement


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


Homework Equations



Henderson-Hasselbach, Ksp equation

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.
 

Answers and Replies

  • #2
31
0
could you illustrate your workings, maybe there is a calculation error or a way you used your equations wrongly
 
  • #3
Borek
Mentor
28,360
2,749
What is your buffer concentration? Knowing pH you can only calculate acid/base ratio, not their real concentrations.
 

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