In our curation process, we focused on thoroughly reviewing the pK a values for the acids (and thereby solvation free energies of anions) across several key solvents: water, methanol, N-methylpyrrolidin-2-one (NMP), ethanol, 1,2-ethanediol, DMSO, acetonitrile, and dimethyl formamide (DMF). These solvents are widely used and have "consensus" proton transfer free energies. We cross-referenced the pK a values for the same compounds across different sources and solvents to identify any discrepancies. Compounds with significant pK a variance (greater than 0.2 and 0.5 pK a units in water and organic solvents, respectively) between different data sources were flagged, and in cases where the variance was smaller, the values were averaged. Any data points that were deemed questionable, outside the reliable measurement range, or likely incorrect were excluded from the final dataset. Throughout this process, we considered special cases where solvent or substituent effects might cause outliers that do not fit typical correlations.