Reilly and HlCKiNBO'JTOM — Method of Distillation in Steam. 1:^9 



known volume, and a measured portion of the diluted solution is withdrawn, 

 filtered, and titrated with standard sodium thiosulphate, after rendering it 

 faintly acid. From a knowledge of the amount of iodine Used originally, 

 and the volume of thiosulphate required for the final titration, the amount of 

 phenol present in the solution can be obtained. It was found advisable 

 during these experiments to determine the amount of iodine required for a. 

 known weight of each phenol before proceeding with the actual determina=- 

 tions. 



1-0 



08 





0-6 



0-4 



0-2 



20 



21 



logjp (volume in flask). 

 Fio 2. 



2-2 



2-3 



The phenol employed was white, and had been purified before use. 

 o-Cresol was obtained from pure o-toluidine by means of nitrous acid, and it 

 was fractionally distilled before use. ^j-Cresol was bought as pure, and was 

 not further purified It had a melting-point of SS'-'J" (uncorrected), and 

 was white in colour. 



A solution of the phenolic body was prepared, containing a known weight 

 of the substance. The amount of iodine required to precipitate the phenol 

 in an aliquot part was determined, and the mean of all the determinations 

 taken. 



SCIENT. PEOC. R.D.S., VOL. XVI., NO. XH. T 



