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FeCO3 (s)-----> Fe+2(aq) + CO3-2(aq) Ksp = 3.5 x 10-11
Na2CO3 (s)-----> 2Na+(aq) + CO3-2(aq)
[ Na2CO3] = [ CO3-2] = 0.293 M
FeCO3 (s)-----> Fe+2(aq) + CO3-2(aq) Ksp = 3.5 x 10-11
initial 0 0.293
change +x +x
equilibrium x 0.293+x
Ksp = [Fe+2] [CO3-2] = 3.5 x 10-11
x (0.293+x) = 3.5 x 10-11
As Ksp is less value then x value would be small and it is insignificant in 0.293+x
hence 0.293x = 3.5 x 10-11
x = 3.5 x 10-11/0.293 = 11.95 x 10-11 M
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