The solubility product of pbbr2 is 8.9 x 10-6. determine, Ask an Expert

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The solubility product of PbBr2 is 8.9 X 10^(-6). Determine the molar solubility in the following.
(a) pure water
I got the correct answer of 1.3e-2 M

(b) 0.14 M KBr solution

I got close to the right anwser with 6.4e-5 but im not sure where i am going wrong.

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