A new method of representing the phase equilibrium of a quarternary system under a constant temperature and pressure on a plane surface has been proposed. The method is to project the three-dimensional space model of the system, axes of which intersect each other at right angles, orthogonally on two of the axual planes. The two projections can represent the complete state of the system, and the treatment of the figure is quite simple and convenient. The crystallization processes in such a quarternary system have been solved mathematically quite in general, and the application of the present method of graphical representation on the solution of the processes has been illustrated.
1. The solubility of magnesium sulfate in magnesium chloride solution at 110°C has been studied with a special reference to the crystallization velocity. In this system, it seems that the formation of the nuclei of kieserite is very difficult, and, when they are once formed, further crystallization takes place smoothly. 2. In the system, NaCl-MgSO4-MgCl2-H2O, at 110 °C, it has been found that the point K lies at about Na2 17.5, Mg 63, Cl2 67 and SO4 13.5 mols per 1000 mols of H2O. The content of magnesium is much larger than what has been estimated by D’Ans, and, accordingly, the löweite field of him should be enlarged. 3. Preliminary experiment on the five component system of sea salts at 110°C has shown that langbeinite may have a larger field than expected from the diagram of D’Ans.
The behavior of electrolytic reduction of oxine at the dropping mercury electrode was discussed. The reduction of oxine in alkaline medium is simple and reversible at the electrode and the possibilities of amperometric titrations with oxine in these mediums were researched.
Magnesium was directy titrated by the amperometric method. The accuracy was 0.7% or better with 10−3 M concentration of magnesium. Its application to the analysis of alloy, brine and sea-water were studied. The interference of calcium and its elimination are described.
1. It is experimentally verified that the reduction of cupric copper by the carbon monoxide absorbed in the copper solution is a reaction of the second order. 2. In the calculation of the velocity constant for the reduction, it is found that the correction made for the carbon monoxide escaping unreacted, under the assumption that the escaping velocity of the carbon monoxide is proportional to its concentration in the solution at that time, is appropriate.