Molar Solubility?

Refer to: http://www4.ncsu.edu/~franzen/public_html/CH201/data/Solubility_Product_Constants.pdf
Ksp for MnCO₃ at 25°C = 2.24 × 10⁻¹¹

Molar solubility for MnCO₃ at 25°C = √(2.24 × 10⁻¹¹) M = 4.73 × 10⁻⁶ M

Molar mass for MnCO₃ = (54.9 + 12.0 + 16.0×3) g/mol = 114.9 g/mol
Solubility for MnCO₃ at 25°C in g/mL = (4.73 × 10⁻⁶ mol/L) × (114.9 g/mol) × (1 L/1000 mL) = 5.43 × 10⁻⁷ g/mL

For such a very dilute solution, density of the solution = density of water = 1.00 g/mL
Solubility for MnCO₃ at 25°C = (5.43 × 10⁻⁷ g/mL) × 100 = 5.43 × 10⁻⁵ g/100 mL water