| Year | Scientist | Contribution |
|---|---|---|
| 1803 | William Henry | Established Henry's Law: dissolved gas concentration proportional to partial pressure above liquid |
| 1887 | François-Marie Raoult | Published Raoult's Law relating vapour pressure to mole fraction; established basis of colligative properties |
| 1887 | Jacobus van't Hoff | Nobel Prize 1901; introduced van't Hoff factor; derived osmotic pressure law π = CRT (analogous to ideal gas law) |
| 1888 | Svante Arrhenius | Proposed electrolytic dissociation theory explaining why electrolytes show i > 1 in colligative measurements; Nobel 1903 |
| 1890s | Ernst Beckmann | Invented Beckmann thermometer for measuring small temperature differences in boiling point elevation and freezing point depression |
| 1901 | van't Hoff | Received first Nobel Prize in Chemistry, partly for work on osmotic pressure and solution theory |
| 1940s–50s | Various | Reverse osmosis principles developed; first practical RO membranes developed for water desalination |
| 1960s | Sidney Loeb & Srinivasa Sourirajan | Developed first practical asymmetric cellulose acetate membranes for RO; revolutionised water treatment |
Key insight: Raoult and van't Hoff's work in the 1880s unified the four colligative properties under a single theoretical framework, showing that dilute solutions behave analogously to ideal gases.