[CO32-] = 0.4 M
At equilibrium:
BaCO3 <----> Ba2+ + CO32-
s 0.4 + s
Ksp = [Ba2+][CO32-]
2.6*10^-9=(s)*(0.4+ s)
Since Ksp is small, s can be ignored as compared to 0.4
Above expression thus becomes:
2.6*10^-9=(s)*(0.4)
2.6*10^-9= (s) * 0.4
s = 6.5*10^-9 M
Answer: 6.5*10^-9 M
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