and Attached Water. 



107 



Estimation of Chlorine. 



A(l) . . 



A (2) . . 



B(l) . . 



B(2) . . 



(Ba=137 ; 



Hence 



Ba 

 Cl 2 

 2H 2 



Weight of 

 substance. 



0-6579 

 0-8559 

 0-8849 

 1-3965 



Chloride of 

 silver. 



0-7640 

 0-9970 

 1-0344 

 1-6344 



Chlorine. 



0-18900 

 0-24665 

 0-25590 

 0-40433 



Per cent, of 

 chlorine. 



28-72 

 28-70 

 28-92 

 28-91 



Ag = 108, S = 32, = 16, 01 = 35-5). 



Calculated. 



, 56-139 

 , 29-098 

 , 14-754 



100-000 



Dried in vacuo. 

 Mean. 



56-561 

 28-912 

 14-527 



100-000 



Dried between 



paper. Mean. 



56-531 



28-710 



14-795 



100-000 



From these analyses, and from the direction of their diver- 

 gence from the theoretical composition of the salt, there can 

 be no doubt about the composition of the salt ; nor is there any 

 doubt that the water is present in simple molecular ratio. 

 Accordingly the hydrated chloride of barium is admirably 

 adapted for examination as to the conditions under which it 

 gives up water. The only statement I can find in this respect 

 is that the hydrated salt gives up the whole of its water at 

 100° 0. 



§ 185. A two-ounce flask with the lip cut off was provided 

 with a glass cap for use alone in the balance-case : the figure 

 explains the rest. A given volume of air (measured by the 



quantity of water leaving the gasometer) is drawn in a given 

 time over a thin layer of the hydrated salt, while the latter is 

 heated to a given temperature. The air passes first through 

 a long tube containing fragments of hydrate of potassium, and 

 then through a tube containing glass and sulphuric acid. 



