THE ANALYSIS OF SILVER DICHROMATE. 



i6i 



It is somewhat surprising that Samples I and II contain the same proportion 

 of volatile matter. This agrees with the result of the silver determinations, 

 however, the samples proving to be otherwise very similar. As is to be ex- 

 pected, Sample III contains less impurity than either of the other two. 



The negative corrections as found above are appUed to all the final weights 

 of silver dichromate given in the table of analyses. 



SPECIFIC GRAVITY OF SILVER DICHROMATE. 



The specific gravity of silver dichromate has been found by Schroder ^ to be 

 4.669, but on account of the uncertainty of most of the older specific gravity 

 determinations this constant was very kindly redetermined for us by Mr. 

 Victor Cobb. The silver dichromate was precipitated from dilute nitric acid 

 solution and once recrystaUized from normal nitric acid. Then it was dried at 

 200° for many hours. The determination was effected by displacement of toluol 

 of specific gravity 0.86218. Care was taken to extract entangled air from the 

 crystals by exhausting the air from the pycnometer in a vacuum desiccator. 



The Specific Gravity of Silver Dichromate, 



* Liebig's Jahresb., 1879, 31. 



