At equilibrium:
Fe3(PO4)2 <----> 3 Fe2+
+ 2 PO43-
3s
2s
Ksp = [Fe2+]^3[PO43-]^2
4.1*10^-11=(3s)^3*(2s)^2
4.1*10^-11= 108(s)^5
s = 3.28*10^-3 M
[Fe2+] = 3s
= 3*3.28*10^-3 M
= 9.84*10^-3 M
[PO43-] = 2s
= 2*3.28*10^-3 M
= 6.56*10^-3 M
Answer:
[Fe2+] = 9.84*10^-3 M
[PO43-] =6.56*10^-3 M
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