LiielHgence and Miscellaneous Articles. 527 



C* 4-85 



H^ 0-40 



Br6 94-75 



10000 



This product possesses therefore the properties and composition 

 of bromoforra ; the density of its vapour was by experiment 8' 632 ; 

 calculation would give 8'55, on the supposition that the molecule of 

 this compound yields 4 volumes of vapour. 



When the distillation of the rough oil witli water is continued, a 

 period arrives at which the vapour, on condensing, deposits only a 

 few oleaginous drops ; the operation must then be stopped. The 

 oily matter which remains at the bottom of the distilling apparatus 

 concretes on cooling and assumes a crystalline appearance. 



To purify this product, it is first washed with water, and then 

 dissolved in boiling alcohol ; the solution on cooling deposits long, 

 brilliant, white silky needles : if, on the contrary, excess of alcohol 

 be employed, and the solution be exposed to spontaneous evapora- 

 tion, large colourless tabular crystals are obtained. The product 

 thus purified is insoluble in water, either cold or hot ; alcohol, when 

 it is concentrated, dissolves it in considerable quantitj' when heated ; 

 on cooling the greater portion is obtained in very regular crystals ; 

 aether and pyroxylic spirit also dissolve it. 



This substance fuses at about 167° F.: when subjected to distilla- 

 tion it is partly altered with the disengagement of bromine ; but a 

 considerable portion distils, and condenses on the cool parts of the 

 retort, in long very brilliant needles. A cold concentrated solution 

 of potash dissolves it ; when heated complete decomposition occurs. 

 When the operation is over, the retort is found to contain bromide 

 of potassium and oxalate of potash ; while the vapour of water 

 carries off an oily aromatic m-atter which possesses the composition 

 of bromoform. The reaction which occurs is readily explained, — 



Ci2 H' Br'o O^ + 4K0 = 2(C* O', KO) + 2KBr2 + C* H- BrS. 



Concentrated sulphuric acid gently heated dissolves a small 

 quantity ; but if heated to ebullition the substance is altered, vapour 

 of bromine and an oily substance being disengaged. Moderately 

 strong nitric acid, when cold, does not alter it ; but when heated a 

 small quantity is dissolved, which is deposited on cooling in the 

 form of fine, white, brilliant needles ; the j)ortion which does not 

 dissolve assumes the appearance of an oil, and again concretes on 

 cooling. 



By analysis this substance aijjieared to consist of — 



C'^ 7-67 



H« 0-21 



Br'o 85-30 



O^ 6- 82 



10000 

 The formation of this product by means of .solution of citrate of 

 potash may be explained by means of the following equation, — 



