Reilly and Hickinbottom — Method of Distillation in Steam. 137 



This could be arranged either by making the jacket of the condenser part 

 of a warm-water circulation system, or by supplying cold water to the 

 condenser in a very slow stream, so that the acid does not solidify. 



The former method is the one more easily regulated, and it is convenient 

 for a number of determinations. Diagram shows the apparatus as finally set 

 up, and as used for the distillation of aqueous suspension of lauric and 

 myristic acids. [Fig. 1.] 



Fia. 1. 



The mixture of acid and water was collected in a series of weighed cylinders. 

 The distillate was washed out by means of neutral alcohol, and the washino-s 

 were repeated until all the acid had been dissolved. It was then titrated 

 with standard barium hydroxide solution, using phenolphthalein as an 

 indicator. It was considered better in the case of these acids to obtain a 

 constant depending on the ratio of acid to water in the distillate, and to 

 neglect the acid originally present in the flask. 



Supposing the system to be a mixture of immiscible and unlike 

 liquids, the amount in the flask should not have any efif'ect. Using a 

 considerable excess of acid this holds approximately, but it is found that 



