[sever] 



SOLUBILITY OF CYCLOHEXANE 



309 



pentane thermometer was used throughout the lower temperatures 

 but owing to the difficulty of noting just when the crystals disappeared 

 the freezing points cannot be taken as being correct to more than one 

 degree. 



TABLE II 

 Temperature at which Cyclophexane Crystals Appear 



Diagram I shows the curve as plotted by using the figures in 

 both Tables I and II. If to the system, cyclohexane at 6.4° liquid 

 sulphur dioxide is added, the temperature will fall; and continued 

 addition of the SO2 will lead at last to the transition point .B where 

 the maximum solubility of sulphur dioxide in oil is reached, and it 

 begins to separate out as a separate layer. As there are now four 



K) 



20 



SO 



40 



x> €o 70 eo 



PEBŒiiT SOz in MIXTURE 



90 



100 



Diagram I 



