328 PROCEEDINGS OP THE AMERICAN ACADEMY 



suspended in 35 times its weight of water, and, after cooling well with 

 ice, the theoretical quantity of finely powdered baric hydrate was 

 slowly added, taking care to avoid at any time a large excess. After 

 the requisite amount of baric hydrate had been added, we allowed the 

 solution to stand over night, and removed the slight excess of baric 

 hydrate which was then usually found present by means of carbonic 

 dioxide. The filtered solution gave, when mixed with an equal vol- 

 ume of alcohol, a voluminous highly crystalline precipitate of baric 

 mucoxychlorate, which could be purified by reprecipitation from 

 aqueous solution by alcohol. In this way we have obtained 73 per 

 cent of the theoretical amount of barium salt demanded by the 

 equation. 



2 C4H2CI0O3 + 3 BaOsHs = 2 BaC^HClO^ + BaCl^ + 4 H^O. 



The mother liquors contain, beside baric chloride, baric a fi di- 

 chloracrylate, which may be obtained without difficulty by the evapo- 

 ration of the solution. Although ether extracts the acid from aqueous 

 solution, it does not take it up very readily, and we have found it more 

 advantageous to precipitate the barium salt exactly with dilute sul- 

 phuric acid, and evaporate the aqueous solution thus obtained in vacuo 

 over sulphuric acid. The acid may readily be recrystallized with 

 care from a little warm water. For analysis the acid was dried over 

 sulphuric acid. 



I, 0.2925 grm. substance gave 0.3420 grm. CO2 and 0.0615 grm. 



H,0. 

 II. 0.1990 grm. substance gave 0.1915 grm. AgCl. 

 III. 0.2000 grm. substance gave 0.1918 grm. AgCl. 



IIL 



CI 23.59 . . . 23.79 23.71 



Mucoxychloric acid is readily soluble in water, alcohol, or ether, 

 and almost insoluble in chloroform, benzol, ligroin, or carbonic disul- 

 phide. From water it crystallizes in stout prisms with bevelled ends, 

 which melt at 114—115°. With ferric chloride it gives, even in ex- 

 tremely dilute solutions, a deep garnet-red coloration. With argentic 

 nitrate it gives an immediate crystalline precipitate of the silver salt. 

 Although more stable than mucoxybromic acid, it is soon decomposed 

 by warming its aqueous solution. 



