RICHARDS AND ARCHIBALD, — CONCENTRATED SOLUTIONS. 353 



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. 



1 



2 



a 



b 

 a 

 h 

 a 



\h 

 a 

 \b 

 a 

 \h 

 ' a 

 [b 

 ' a 

 '6 



\Vt. of 



Solution 



taken. 



grm. 



80.2 

 75.6 

 75.4 

 78.4 

 59.4 

 6L5 

 92.2 

 99.4 

 57.4 

 67.0 

 48.7 

 76.4 

 50.0 

 47.5 



Vol. 



of 



Solution. 



75.4 

 69.3 

 63.2 

 70.9 

 5L6 

 53.5 

 76.5 

 82.5 

 46.2 

 53.9 

 37.0 

 58.1 

 36.8 

 34.9 



Wt. of 

 HgS 



found. 



m. g. 



5.2 



4.7 



6.9 



7.2 



10.3 



10.8 



21.0 



22.8 



17.0 



19.9 



16.4 



25.8 



16.1 



15.2 



Wt. of 

 HgCl, in 

 1 Litre of 

 Solution. 



grm. 

 0.022 



0.033 



0.082 ) 



0.079 S 



0.118) 



0.118) 



0.232 ) 



0.280 ) 



0.320 ^ 



0.323 ) 



0.429 ) 



0.431 ) 



0.518 ) 



0.519 S 



0.51 n 



0.509 ) 



Mean Wt. 

 from two 

 Det.ofHgCl. 

 in 1 Litre 

 Solution. 



grm. 

 0.022 



0.081 



0.118 



0.231 



0.322 



0.430 



0.518 



0.510 



C 



Cone, of 

 CaClj Solu- 

 tion in 

 Equiv.Grms. 

 (i CaClj). 



equiv. 

 0.72 



1.00 



2.00 



2.50 



3.52 



4.64 



5.85 



7.80 



9.00 



1000 ^, 



Milligrams 



HgClo for 



every i Mol. 



CaCl,. 



n.G 



33.0 



40.5 



47.2 



65.6 



69.3 



73.4 



66.4 



56.6 



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

 VOL. xxxvii. — 23 



