Combination of Bodies with Chlorine. 431 



upon the solution. This would tend to render the results a 

 little too high ; but its precise effect I had no means of ascer- 

 taining. The quantity of chlorine which entered into combi- 

 nation in each experiment, was determined by precipitating 

 the solution (previously acidulated with nitric acid to dissolve 

 the subchloride) by nitrate of silver and weighing the chloride 

 of silver. The apparatus was considerably larger than that 

 employed in the foregoing experiments. In the next table, M 

 designates the weight of the chloride of silver. 



2. 3. 



3'140 grms. 2*793 grms. 



1.5°-0 14.°-2 



1°'7 r-3 



3^-10 2°-60 



3°-12 2°-60 



36.5-3 grms. 399-7 grms. 

 27*5 grms. 27*5 grms. 



2. 3. 



1580 1610 



In two experiments, the number 162 was obtained for the 

 heat arising from the solution of the chloride of zinc, which 

 being deducted from the mean number 1589, there remains 

 1427 for the heat of combination. 



We have, therefore, for the heat evolved during the com- 

 bination of — 



One litre chlorine with zinc . . 4524 

 One gramme chlorine with zinc . 1427 

 One gramme zinc with chlorine . 1529 

 One equivalent zinc witli chlorine 6309* 



Copper and Chlorine\. 



The experiments with copper were in all respects similar 

 to those with zinc, except that the chlorine was estimated by 

 volume and not by weight. 



1. 2. 3. 4. 



M 246-0 c.c. 241-5 c.c. 233*5 c.c. 246-4 c.c. 



B 29-53 in. 29-73 in. 29-56 in. 29-56 in. 



T 17^-8 18°-9 18°-4 19''-3 



E 0°-6 0°-6 0°-7 0°-7 



I \°'1\ l°-62 l°-63 l°-67 



Ic r-7I ]°-62 l°-63 r-67 



W 371-3 grms. 382-1 grms. 382-8 grms. 382-7 grms. 



V 27-3 grms. 27-3 grms. 27-3 grms. 27*3 grms. 



• These results arc nlniost iilciiticiil with tliose wliicli I oblaiiicil for- 

 merly l)v a ()roccss liidcrini,' slightly from that now described (Transactions 

 of the lioyal Irish Academy, xix. |). 40G). 



t These experiments were not in the original paper. 



