Wells — Complex Chlorides containing Gold. 415 



Although the agreement of the results with the first 

 formula is rather close, the second one is perhaps more 

 probable, since there is no doubt that the products were 

 contaminated to an appreciable extent with cesium chlo- 

 ride, on account of the method used in preparing them for 

 analysis, the high concentration of the mother-liquors, 

 and also because the crystals were of exceedingly small 

 size and thus presented very large surfaces for contam- 

 ination. 



Another crop of the salt was then prepared from 200 g. 

 of cesium chloride, 1.5 g. of gold (as HAuClJ and equal 

 volumes of concentrated hydrochloric acid and water, 

 making a total volume of about 900 cc. After the crop 

 had been formed by cooling in a counterpoised beaker, the 

 whole was weighed, and then, since the amount of gold 

 remaining in solution was comparatively very small, it 

 was possible to calculate the amount of cesium chloride 

 corresponding to the volatile part of the mother-liquor. 

 The crystals were taken out, pressed with filter papers 

 very rapidly, so as to avoid evaporation as far as pos- 

 sible, and, without air-drying, the loss in weight at 100° 

 was determined. From this the amount of cesium chlo- 

 ride derived from the mother-liquor could be calculated. 

 The analysis of the dried product after correcting for the 

 cesium chloride derived from the mother-liquor is given 

 beyond (V), while a duplicate portion of the same crop 

 was analyzed also (VI). Analysis VII was made from 

 a crop obtained from a solution containing 100 g. of 

 cesium chloride and 1 g. of gold (as chloride) in a volume 

 of 900 cc. made up of about two volumes of concentrated 

 hydrochloric acid to one of water. The product was 

 washed somewhat by diluting the last part of the mother- 

 liquor with an equal volume of concentrated hydrochloric 

 acid, without any apparent decomposition. This crop 

 was dried at 100° without determining the loss, but it 

 was assumed that a correction for cesium chloride about 

 one-fourth that of the previous crops should be applied 

 to it. The results were as follows : 



v. 



CsCl 47.81 



AuCL 50.98 



Corrected for CsCl, 1.13% 







Calculated for 



VI. 



VII. 



Cs 5 Au,Cl 14 



47.84 



47.61 



48.02 



50.96 



51.12 



51.98 



1.00% 



0.25% 





