RICHARDS AND ARCHIBALD. — CONCENTRATED SOLUTIONS. 358 



could a trace of mercury be detected in the solution. Moreover, no gray 

 precipitate of reduced mercury was ever observed when the cadmium solu- 

 tion was shaken with calomel in the first place. One infers that there 

 is not in dissolved cadmic chloride any considerable concentration of a 

 molecular species capable of combining with mercuric chloride. 



This conclusion is quite in accordance with the fact that the tempera- 

 ture-coefficient of the potential of the calomel electrode with solutions of 

 cadmic chloride exhibits none of the irregularities observed when other 

 chlorides are used.* 



Mercuric Chloride found in Solutions of Calcic Chloride. 



No of 

 Exp. 



a 



b 

 a 

 b 

 a 

 1 b 

 a 



(a 



7 



h 



h 



Wt. of 



Solution 

 taken. 



grin. 



80.2 

 75.6 

 75.4 

 78.4 

 59.4 

 61.5 

 92.2 

 99.4 

 57.4 

 67.0 

 48.7 

 76.4 

 50.0 

 47.5 



Wt. of 

 HgCl 2 in 

 1 Litre of 

 Solution. 



grm. 

 0.022 



0.033 



0.082 ) 



0.079 ) 



0.118) 



0.118 S 



0.232 ) 



0.230 ) 



0.320 ) 



0.323 ) 



0.429 ) 



0.431 ) 



0.518 ) 



0.519 ) 



0.511) 



0.509 ) 



c 

 Mean Wt. 

 from two 

 Det.ofUgCl, 

 in 1 Litre 

 Solution. 



grm. 

 0.022 



0.081 



0.118 



0.231 



0.322 



0.430 



0.518 



0.510 



C 



Cone, of 

 CaOl, Solu- 

 tion in 

 Equiv.Grms. 

 Q CaCl 2 ) 



eqmv. 



0.72 

 1.00 



2.00 



2.50 



3.52 



4.64 



5.85 



7.80 



9.00 



1000 j, 



Milligrams 



HgCl 2 for 



every h Mol. 



CaCl„. 



31.6 



40.5 



47.2 



65.6 



69.3 



73.4 



66.4 



56.6 



* llioliards, These Proceedings, 33, 1 (1897). 

 vol. xxxvii. — 23 



