464 PROCEEDINGS OP THE AMERICAN ACADEMY. 



100.00 100.49 



(4.) CUPRIAMMONIUM Lactobromide, Cu(NH3)2BrC3H503. 



This compound is easily obtained by dissolving syrujiy lactic acid 

 and about a third of its weight of cupric bromide in alcoiiol, and then 

 passing dry ammonia gas into the solution. Basic salts of copper do 

 not form readily here, but if an insufficiency of lactic acid is added, 

 Cu(NH3)9Br2 will crystallize out. The crystals are of a strong light 

 blue color, with a faint tinge of purple ; they may be obtained of great 

 size. They are permanent in the air, and at once decomposed by 

 water. 2.6377 grams of the substance were found to di.splace 1.0334 

 grams of toluol, indicating a specific gravity of 2.20. 



For analysis the salt was washed twice with alcohol, and pressed 

 bet"veen filter paper. 



Analyses of Cu(NH3)2BrC3Ho03. 



I. 0.1742 gram of the substance gave on electrolysis 0.0418 gram 



of copper. 

 II. 0.1108 gram of the substance yielded 0.0786 gram of argentic 

 bromide. 



III. 0.1916 gram of the substance yielded 0.1360 gram of argentic 



bromide. 



IV. 0.0850 gram of the substance required on distillation G.25 cubic 



centimeters of decinormal acid solution for neutralization. 

 V. 0.0987 gram of the substance required 7.38 cubic centimeters of 



decinormal acid. 

 VI. 0.1634 gram of the substance yielded on combustion 0,0819 

 gram of carbon dioxide. 



Analyses II. and III. were made from different samples of the 

 substance. 



