200 



EXPERIMENT STATION. 



[Jan. 



Solubility. 



Manufacturek, 

 Water (per cent.). 

 Calcium acetate soluble: — 



Arsenic trio.\ide (per cent.), 

 Water .soluble (Hilgard Method): 



Calcium oxide (per cent.), . 



Arsenic trioxide (per cent.), 



Solids (per cent.), 

 Lime water soluble: — 



Arsenic trioxide (per cent.), 



Ca 



67.87 



3.14 

 11.58 

 16.54 



The calcium acetate soluble appeared to have no particular 



significance, and the test was eventually dropped. The water 



soluble results are only approximate, as slight variations in 



temperature or agitation caused marked differences. Solubility 



is apparently not a result of hydrolysis, as proportionally the 



lime passed into solution almost as rapidly as the arsenic. If 



hydrolysis played any part it would seem to be inappreciable. 



Lime arsenite was nearly insoluble in lime water. In order to 



secure additional data relative to the solubility of lime arsenite, 



1 gram of sample C.-j, after drying, was subjected to the action 



of various solvents for twenty-four hours in stoppered flasks 



with occasional agitation, the results of which are stated 



below : — 



Solubility Tests, Sample Cs Dried. 



Solvent. 



Amount of 

 Solvent 



in a Liter 

 of Water 

 (Grams). 



Soluble 



A.soOa 



(Per Cent.). 



Lime. 



Remarks. 



Di.stilled water, .... 



Water saturated with CO2, 

 Ammonium hydroxide (concentrated). 

 Ammonium carbonate, 

 Ammonium chloride, 

 Ammonium nitrate, . . 

 Ammonium nitrite solution. 

 Ammonium sulfate, .... 

 Sodiiim carbonate (anhydrous), 

 Sodium V)icarl)onat<;, 

 Sodium chloride, .... 

 .Sodium nitrate, .... 



Sodium nitrite, .... 



Sodium sulfate (anhydrous), . 

 Boiling water, 1 hour, 



38 45 

 62.22 

 36.66 

 64 36 

 53.40 

 51 97 

 43 06 

 .52 71 

 ,59.32 

 62 19 

 41.20 

 40 .53 



40 72 



41 08 

 58.63 



Present. 

 Present. 

 Present. 



Trace. 

 Present. 

 Present. 

 Present. 

 Present. 



None. 



None. 

 Present. 

 Present. 

 Present. 

 Present. 



Much. 



' Contained .39 per cent, of ferric and aluminum oxides and 

 > About 5 gallons of gas used, water pressure. 



I per cent, of magnesium oxide. 



