86 PROF. H. E. ROSCOE ON CERTAIN 



to air, and small particles being immediately converted into 

 drops. The crystals do not decrepitate on cooling, like 

 those of the hexachloride. On treatment with larger 

 quantities of water the pentachloride forms an olive-green 

 solution, although the greater part is at once decomposed 

 into the blue oxide and hydrochloric acid. With carbon 

 disulphide a deep blue solution is formed ; but the chloride 

 is only slightly soluble. 



The analyses were made as described under the last 

 compound, except that the water needed for the decom- 

 position was placed in a separate boat, from which it was 

 distilled on to the one containing the chloride in a current 

 of hydrogen ; this was necessary, owing to the violent 

 action of water upon the pentachloride. 



Analyses of Tungsten Pentachloride, WC1 5 . 



I. II. III. 



Weight of chloride taken ©'8973 1*0781 07007 



„ tungsten obtained... 0*5488 



,, tungsten trioxide ... 0-5758 



„ silver chloride 2-1262 1*3831 



Percentage of chlorine 4878 48*38 



„ tungsten 50*89 50-90 



Calculated. Mean found. 



Tungsten, W = 184 50*89 5°'9° 



Chlorine, Cl 5 = i77*5 49'U 48*58 



361-5 ioo-oo 99"48 



Tungsten pentachloride melts completely at 248 ° and 

 solidifies (as a mean of several determinations) at 242 C. 

 (both corrected) ; and it boils at 2J5°'6. 



The vapour-density of tungsten pentachloride was deter- 

 mined in sulphur-vapour at 440 , and in mercury-vapour 

 at 350 . 



