NHsCl.... Very soluble with evolution of ammonia. 
| br €) Os bee Soluble. 
HeCls....:.. Slightly soluble. 
SnCle..... Insoluble, unchanged. 
CoClz ... . Reacts withevolution of heat, forming greenish yellow precipitate. 
PbBrz .... Reacts, forming white precipitate which afterward redissol ves. 
1 sae Insoluble, unchanged. 
Cdlz......Reacts, forming white, insoluble precipitate. 
AgCN ....Slightly soluble. 
Hg(CN)e. .Shghtly soluble. 
AgNOs ...Soluble with evolution of much heat. 
NaNOs... Insoluble, unchanged. 
Pb(NOs)2..Reacts, forming white, insoluble precipitate. 
It is thus seen that, in all cases where the salt dissolves appreciably, 
there is evidence of chemical action, either through the evolution of heat 
or the formation of a precipitate, or both. In the case of ammonium 
chloride the well known action of evolution of ammonia was observed. 
There is, therefore, every reason for expecting that complex salts will be 
formed in every case excepting the last, where no doubt ethyl amine 
hydrochloride is produced, as Shinn has pointed out. If this be true, the 
question still remains as to whether the reaction is complete as soon as 
the salt is all in solution, so that henceforth all physical properties 
will be those of a solution in ethyl amine of a definite double or complex 
salt, changing with dilution only with respect to the degree of ionization. 
With the investigations of Hofmann and Marburg and of Bonnefoi in 
mind, the answer to this question would certainly be negative. We should 
expect that the ratio of ethyl amine to simple salt combined with it would 
not only change with lowering of temperature, but that it would increase 
with decreasing concentration, because as dilution progresses the ratio 
of amine to salt in solution increases. If the conductivity of the complex 
salt is much less than that of the simple salt the change in molecular 
conductivity with change in concentration would be the resultant of two 
influences, i. e., change in ionization and change in complexity of the 
ions. The migration velocity of a complex cation containing one or more 
molecules of ethyl amine could not be very high, and it is not likely that 
such a compound would possess a very high degree of ionization. This 
fact would then result in a more or less gradual tendency toward falling 
off in the molecular conductivity with increasing dilution, since we are 
actually dealing not only with more complex compounds, whose ioniza- 
[12—23003 ] 
