827 



These lines of equilibrium for 140° and for 160" are drawn in 

 figure 2 on rectangular coordinate paper. It appears from these lines 

 that the *S:r-content at 160° is only liltle higher tlian at 140°. In 

 this range of temperature an important shifting of the equilibrium 

 does, therefore, not take place. 



lbo' 



Seen from below the lines are convex, i.e. with increasing total 

 sulphur content the relative quantity of *S- increases more than the 

 relative quantity of *S;. From this follows that the toluene present 

 shifts the equilibrium towards the side of «S,. In very dilute solution, 

 where the quantity of toluene is practically constant, the equilibrium 

 must move towards the side of S-k with increasing dilution, as the 

 molecule S- is smaller than the molecule >S\ (fourth communication 

 p. 369). The accuracy of the experiments in case of great dilution 

 is, however, not sufficient to allow us to demonstrate this. 



4. Comparison of the equilihrium Si ^ Stz in toluene and in 

 sulphur chloride. 



In order to be able to compare the quantity of /S:r in toluene with 

 that in sulphur chloride, we must also calculate the quantities of 

 /Stt and aS;, piesent in case of equilibrium, for these latter solutions 

 from the solubility of rhombic sulphur. This is, however, not possible 

 without further suppositions about the course of the solubility lines 

 of S; in mixtures of /S;r with sulphur chloride. 



The course of these solubility lines being unknown, only a probable 

 situation of the equilibrium Sj'^St, in sulphur chloride can be given, 

 and this in the following way: 



We assume a certain situation for the line of equilibrium ASTr^^;, 

 and construct the solubility lines for 25°, 0°, and — 60° with this 

 line and the values of the solubility in Table I of the first com- 

 munication. 



