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## 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.