McClenahan — Hy droits Thallic Chloride. 



Ill 



Composition of the Salt. 





I. 



Found. 

 II. 



Mean. 



Theory for 

 T1C1 3 -2H 2 



Thallium _-.. 



59-18 



59-24 



59-21 



5891 



Chlorine .. 



30-77 



30-72 



30-74 



30-70 



Water (by difference).. 







10-05 



10-39 



100-00 



100-00 



Portions of this salt were submitted to dehydration in air in 

 the manner previously described, the boats holding the sub- 

 stance being heated in the tube-bath, generally for intervals of 

 fifteen minutes, and then cooled in a desiccator and weighed. 

 The data of these experiments are shown in the following 



table and diagram 



Dehydration of TlCl,'2lf 2 0, in Air. 



Weight 

 taken. 

 grm. 



2471 

 Per 



0-3441 

 Per 



0-3083 



Per 

 0-3081 



Per 

 0-2500 



Per 

 0-2250 



Per 



'grm. 

 cent, 

 grm. 

 cent, 

 grm. 

 cent, 

 grm. 

 cent, 

 grm. 

 cent, 

 grm. 

 cent. 



Loss of Weight. 



hr. 



X 



hr. 



X 



hr. 



0-0097 

 3-92 5 



0-01910 

 5 55 7 

 0209 

 6-78 7 

 0-0168 

 5'45 7 

 0-0197 

 7-88 8 

 0-0177 

 7-87 8 



0134 

 42 6 

 0248 

 21 7 

 0241 

 82 8 

 0221 

 17 7 

 0217 

 68 9 

 0192 

 53 9 



0160 



48 



0266 



73 



0263 



53 



0237 



69 



0235 



40 



0203 



02 



x 



hr. 



0-0197 

 8-00 

 0-0276i 

 8-02 

 0-0283 

 9-18 

 0-0256 

 8-31 

 0-0254 

 10-16 

 0-0221 

 9-82 ! 



X 



hr. 



0-0221 



8-94 



0-0308 



8-95 



0-0302 



9-80 



0-0281 



9-12 



0-0264 



X 



hr. 



X 



hr. 



hr. 



0-0243 



9-88 



0-0345 



0-0250 

 10-12 

 0-0358 



0-0255 

 10-32 



0-0371 



}4 



hr. 



2 

 hrs. 



10-03 10-40 



0-0335 .... 

 10-87 



0-0306 



9-93 



0-0279 



10- 



0-0324 

 1052 



0-0269 0' 

 10-89 11 



0-0382 ; 0- 

 11-10 ill 



0273 

 05 



0390 

 33 



10-56 11-16 

 0-0228 0-0235 

 10-13 110-45 



Chlo- 

 rine 

 loss. 



0-51 

 b"-54 

 b"-50 

 : 61 



b"-45 

 0-51 



Water 

 loss. 



10-54 

 10-75 

 10-37 



9-91 

 10 -71 



~9 V 94 



The residues remaining after heating were treated with 

 water, the small amounts of thallo-thallic chloride found in 

 every case and indicating the slight decomposition of the thal- 

 lic chloride were dissolved by nitric acid, and the combined 

 chlorine was precipitated as silver chloride. The difference 

 between the chlorine thus found and the chlorine of the origi- 

 nal salt is tabulated as u chlorine lost " in the process of dehy- 

 dration. The loss of water was computed as the difference 

 between the total loss observed and the hydrogen chloride cor- 

 responding to the chlorine lost. From these results it is 

 obvious that the salt of constitution corresponding to the sym- 

 bol T1C] 3 '2H 2 loses the first molecule of water (5*2^) with 

 comparative ease, while the second molecule disappears grad- 

 ually on prolonged heating. 



