SOLUBILITY OF AMMONIA IN AQUEOUS-SOLUTIONS OF SODIUM-SULFATE AND AMMONIUM-SULFATE AT TEMPERATURES FROM 333.15 K TO 433.15 K AND PRESSURES UP TO 3-MPA

As part of an ongoing project dealing with experimental and theoretical work on phase equilibria in aqueous solutions containing weak electrolyte gases like ammonia, hydrogen cyanide, sulfur dioxide, or carbon dioxide, the solubility of ammonia in aqueous solutions of sodium sulfate and ammonium sulfate was measured by a synthetic method in the temperature range from 333.15 to 433.15 K at total pressures up to 3 MPa. The model proposed by Edwards et al. is used to correlate the data. That model is extended to include the formation of one or more solid phases. Experimental results and the correlations are reported and compared with literature data and other correlations.