The Gibbs free energy required to dissolve a solute from the ideal gas phase into a solution, both at a standard state of 1 mol/L, is the solvation free energy ∆G solv . Eq. 1 relates the solvation free energy in the molar standard state to the dimensionless gassolution partitioning coefficient K and the molar concentrations of the solute in the gas phase c gas and in solution c solution . If the gas-solution partitioning coefficient is known for multiple solvents (K X 1 and K X 2 ), the dry partitioning coefficient for the solute between those solvents (P dry,X 1 -X 2 ) and the relative solid solubility in two different solvents (