Index of Refraction, Density, and Solubility of AmmoniumIodide Solutions at High Pressure.

An asymmetric moissanite anvil cellis used to study aqueous solutionsof ammonium iodide at pressures up to 10 kbar. The index of refractionis measured using the rotating Fabry–Perot technique, withan accuracy of approximately 1%. The mass density and molar volumeof the solutions are estimated using the measured index values, andthe molar volume is used to predict the pressure dependence of thesolubility. The solubility derived from the index of refraction measurementsis shown to agree with that which is determined by direct observationof the onset of crystallization. [ABSTRACT FROM AUTHOR]