Solubility data for CHC12F(F-21), CH2C1F(F-31), CH3Br, and CH3CC1F2(F-142b) in water and NaC1 solutions are presented for a range of temperatures, pressures, and salt concentrations. The apparatus and experimental procedure are discussed, and generalized methods of correlation are described. Heats of solution, obtained from the solubility data, are also presented. SYMBOLS A,B, C,D, E, F, G, M, N--empirical constants H --Henry's law constant (mm Hg/wt. ~ solubility) Hp-pseudo-Henry's law constant AH --heat of solution (calories/g mole) P --partial pressure of solute gas above the solution (mm Hg) R --universal gas constant S --weight per cent solubility of solute gas T --temperature (Β°K) W ~ weight per cent NaCI (gas free basis) f --fugacity SOLUBILITY OF FOUR GAS HYDRATE FORMERS 343 CH2CIF(F-31), CH3Br , and CHaCC1F2(F-142b
) in water at temperatures ranging from 5 Β° to 25Β°C and pressures ranging up to the respective vapor pressures. In addition, experimental solubility data on the last three of these have beenobtained in aqueous NaCI solutions at concentrations up to 10 weight per cent salt for roughly the same conditions of temperature and pressure. The experimental data for the three agents, studied in both water and NaC1 solutions, indicate that in all cases the solubility obeys Henry's law and decreases exponentially with increasing salt concentration. Henry's law is not followed by the CHC12 F (F-21). Heats of solution, for each of the four gases studied, were determined and found to remain constant (with the exception of that of CHC12F(F-21)) for the conditions of temperature, pressure, and NaC1 concentration encountered. Activity coefficients, calculated from the solubility data of CH 3 CCIF 2 (F-142b) defining deviations from Raoult's law have been reported elsewhere (3).