THE RECIPROCAL SALT-PAIR SYSTEM: SODIUM CHLORIDE – AMMONIUM SULPHITE – SODIUM SULPHITE – AMMONIUM CHLORIDE – WATER AT 20 °C. AND 60 °C.: PART II: THE QUATERNARY SYSTEM

In the above quaternary system at 60 °C., besides those representing the four salts at the corners of the Janecke diagram two other saturation areas were found. At 20 °C. there are three, and possibly more than three additional areas. In the course of the present work it was not possible to establish the nature of the solid phases in these additional areas of the quaternary system. However, the data of Lewis and Rivett suggest that at least some of these unknown areas may indicate the presence of different solid solutions of sodium sulphate in sodium sulphite. This quaternary system appears to be a rather complex one and much further work remains to be done in order to complete the knowledge of it at 60 °C. and 20 °C., particularly at the latter temperature.