a 
” ’ “ 
Fade 
Silicon with Alcoholic Radicals, 311 
The first determination of silicon was made by heating the 
substance in a sealed tube with nitric acid for several hours, at 
180°-190°, dissolving the contents of the tube in caustic potash, 
and estimating the silicic acid in the solution in the ordin 
In the second determination, dilute chlorhydric acid and 
chiorate of potassium were substituted for the nitric acid, and 
the operation was carried on in a sealed tube as before. It is 
somewhat difficult to dissolve all the silicie acid which adheres 
to the tube by caustic potash. - 
The vapor-density of silicic ethyd was deduced from the fol- 
data : 
lowing 
Difference of weights of thebulb - - =05248 grms. 
Temperature of the balance,. - - 14° 
Temperature of the oil-bath, Seok. 214°2 
rometer, - - - bee 761-4 mm. 
Capacity of the bulb,- - - - 2110ce. 
Air remaining in the bulb, - - 1°3 ce. 
Vapor-density=5-141. 
Calculated’ yapor-density, 4-986. 
The results thus obtained show that silicic ethyd corresponds 
to the chlorid of silicon, and that the reaction by which it is 
ormed may be expressed by the equation : 
SiC], +2Zn(C,H,),= Si(C,H,),+ 2ZnCl,. 
them, 
xcept that instead of burning with a carbon-smoke, it gives a 
as secondary products of the reaction. 
oo i of zine-ethyd were pporaet 
at once, and an excess of chlorid of silicon was always 
The first portions, which distilled below 140°, were a mixture of 
chlorid of silicon with silicic ethyd, and they were always treated 
over again with a fresh quantity of zinc-ethyd in the next ope- 
Tation, 
We usuall . digester in an oil-bath, at 180°-200°, 
sing a pr fee rib begs construction to Bunsen’s, and 
kept each charge at that temperature for about ten hours. After 
Opening thedigester and distilling up to 140°, water was added 
and the distillation continued as ong as any silicic ethyd con- 
