( 263 ) 



Duplicate determinations made by again titrating an aliquot portion 



from the bodies gave results within the limit of experimental error. 



The graphic representation Kig. I shows that the line, except for 



a small deviation at the start, is a straight one 



Quantity of substance 



shaken with 100 re. 



of water 



150 mgrs. a 



1 gr. 



100 mgrs. « + 0.3020 



100 mgrs. « + 0.4120,? 



Temp. 25. c MW 201.5. 



cc. of alkali Total solubility in 

 Pipetted off (0.0295?*) grains per LOOcc. 



of solution 



37.611 grs. 

 18.378 ., 

 29.650 „ 

 23.240 „ 



These titrations are accurate within 2 drops of 0.03 normal alkali. 

 As this corresponds with about 0.7 mgr. of' chloro- and 0.8 mgr. ot' 

 bromonitrobenzoic acid the last figure of the numbers of the last 

 column may be about one unit wrong. The tables have been con- 

 structed by Mr. Polak. 



Quantity of ,-> 

 Fig. 2. Total solubility of mixtures of the chloronitrobenzoic acids, 

 constructed according to the table. 



As may be seen from fig. 2, the line is practically a straightone. 



The nitrations of m-chloro- and w-bromobenzoie acid were carried 

 out in the approved manner by means of absolute nitric acid at 

 0° and at — 30 In order to ascertain whether all had been converted 

 into mononitro-acids the irtolecular weight of the products formed 



