At equilibrium:
BaCO3 <----> Ba2+ + CO32-
s s
Ksp = [Ba2+][CO32-]
5.1*10^-9=(s)*(s)
5.1*10^-9= 1(s)^2
s = 7.141*10^-5 M
Molar mass of BaCO3,
MM = 1*MM(Ba) + 1*MM(C) + 3*MM(O)
= 1*137.3 + 1*12.01 + 3*16.0
= 197.31 g/mol
Molar mass of BaCO3= 197.31 g/mol
s = 7.141*10^-5 mol/L
To covert it to g/L, multiply it by molar mass
s = 7.141*10^-5 mol/L * 197.31 g/mol
s = 1.409*10^-2 g/L
1000 mL of water is 1 L
So,
Amount dissolved in 1 L is 1.409*10^-2 g
Answer: 1.4*10^-2 g
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