To calculate the molar solid solubility of solutes, we relate the unknown solid solubility of the solute in one organic solvent to its known solid solubility in another solvent. The solid solubility in both solvents (S X 1 and S X 2 , in mol/L) are related to the dry partitioning coefficient of the solute between both solvents (P dry,X 1 -X 2 ) and hence to the gas-solution partitioning coefficients of the solute in both solvents (K X