84 M.C. Lea on reactions of Ethylamine and Diethylamine. 
very well marked. 
If protochlorid of mercury be precipitated with a very | 
excess of ammonia, the precipitate readily dissolves on the addi- 
tion of a little acetic acid, the liquid remaining very strongly 
alkaline. Ethylamine behaves in the same way, but the precip- 
itate caused by diethylamine does not redissolve under the same 
circumstances. Acetic acid may be added, in fact, until the liquid 
acquires a decidedly acid reaction without causing a solution. — 
Diethylamine shares the property of ethylamine and ammonia 
of reddening alcoholic solution of dinitronaphthaline. 
The analysis of the platinum salts of the ethyl bases requires 
great circumspection in the application of heat, as they decompose 
at a far lower temperature than the chloroplatinate of ammonium. 
The diethylamine salt blackens at a temperature at which the 
upper part of the porcelain crucible remains cool enough for it 
be lifted by the fingers. 
- Action of Iedine on Ethylamine and Diethylamine. 
When aqueous diethylamine is poured over iodine in powder, 
it becomes milky and there collects at the bottom of the vessel 4 
black substance in thick oily drops. These when heated in 4 
& 
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ed on 
