BaSO4 <--> Ba+2 + SO4-2
Ksp = [BA+2][SO4-2]
a)
in water
Ksp = [BA+2][SO4-2]
1.1*10^-10 = S*S
S = sqrt(1.1*10^-10) = 1.05*10^-5 M
b)
in [SO4-2] = 2 M
so
Ksp = [BA+2][SO4-2]
1.1*10^-10 = [Ba+2](2)
[Ba+2] = (1.1*10^-10)/2 = 5.5*10^-11 M
then
BaSO4 = 5.5*10^-11 M
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