Solvents are arranged in order of increasing polarity index, a relative measure of the degree of interaction of the solvent with various polar test solutes.
| Solvent | Polarity Index |
|---|---|
| Pentane | 0.0 |
| 1,1,2-Trichlorotrifluoroethane | 1.6 |
| Cyclopentane | 0.2 |
| Heptane | 0.1 |
| Hexane | 0.1 |
| Iso-Octane | 0.1 |
| Petroleum Ether | 0.1 - 0.3 |
| Cyclohexane | 0.2 |
| n-Butyl Chloride | 2.0 |
| Toluene | 2.4 |
| Methyl t-Butyl Ether | 2.5 |
| o-Xylene | 2.5 |
| Chlorobenzene | 2.7 |
| o-Dichlorobenzene | 2.8 |
| Ethyl Ether | 2.8 |
| Dichloromethane | 3.1 |
| Triethylamine | 3.2 |
| Ethylene Dichloride | 3.5 |
| n-Butyl Alcohol | 3.9 |
| n-Butyl Acetate | 4.0 |
| Isobutyl Alcohol | 4.0 |
| Methyl Isoamyl Ketone | 4.0 |
| n-Propyl Alcohol | 4.0 |
| Tetrahydrofuran | 4.0 |
| Chloroform | 4.1 |
| Methyl Isobutyl Ketone | 4.2 |
| Isopropyl Alcohol | 4.3 |
| Ethyl Acetate | 4.4 |
| Methyl n-Propyl Ketone | 4.6 |
| Methyl Ethyl Ketone | 4.7 |
| 1,4-Dioxane | 4.8 |
| Acetone | 5.1 |
| Methanol | 5.1 |
| Ethanol | 5.2 |
| Pyridine | 5.3 |
| 2-Methoxyethanol | 5.4 |
| Acetonitrile | 5.8 |
| Propylene Carbonate | 6.0 |
| Trifluoroacetic Acid | 6.0 |
| N,N-Dimethylformamide | 6.4 |
| Dimethyl Acetamide | 6.5 |
| N-Methylpyrrolidone | 6.7 |
| Dimethyl Sulfoxide | 7.2 |
| Water | 10.2 |