18 J. M. Crafts on Ethers of Arsenic Acid. 
The last determination is probably too small through some 
fault of manipulation. It is to be expected that the numbers 
should be a little too high, since the arsenite of ethyl is decom- 
osed the slightest. trace of moisture, leaving a deposit of 
arsenious acid in the bulb. The arsenite of ethyl is a colorless 
liquid with a peculiar, but not disagreeable, odor, and sufficiently 
‘volatile to make its presence ges perceptible in a room, 
where it is standing in an open te 
ers of arsenic do not appear to have the extraordin- 
poisonous properties, which are attributed to arseniuretted 
ee ogen, at least I have ie ia no inconvenience after having 
worked with them for several year 
Arsenite of ethyl is miscible in any proportion with alcohol 
and ether, but it is decomposed by aqueous alcohol. The only 
products of decomposition are arsenious acid and alcohol, and 
no compound ether with the formula, (rH ASO | is formed. 
This ether is also not produced according to the reaction: 
4(C. 2 Hs)s AsO;+ As,O3;= 3(C.H,),A%0, 
when arsenite of ethyl is heated to 300° with arsenious acid. 
Arsenite of ethyl at its boiling point dissolves about 4 its 
weight of arsenious acid, but a considerable quantity separates 
out, when the solution is allowed to become cool. Arsenite of 
ethyl can be distilled unchanged over dry arsenious acid. 
case the reac i Tol to the formation of alcohol and bromid | 
of 2 arsenic, ait it may be expressed by the equation : i 4 
(C,H;);AsO;+3HBr=8C,H,O+ As Br. 
All that is waa to study this reaction is to pass oy brom- 
hydric acid through arsenite of ethyl, when the alcohol can be — 
of en by distillation, leaving a ew residue of bromid 
of arse 
for ates: in the ethyl, and that the substituted ether thus 
formed i is decomposed by the bromhydric acid which is evolved 
in its formation. 
- Iodine does not act upon the arsenite of ethyl, and the two 
| ‘bodes can be separated by distillation. Dry ammonia a. is 
7 : 
bees without action upon the arsenite of ethyl as 
e other ethers of arsenious acid, and they can ever be 
in an a of ammonia without alteration. 
