672 
ME. P. G-KIESS ON A NEW SEEIES OE BODIES IN 
ether. The crystals are separated without delay from the mother-liquor and dried over 
sulphuric acid. 
0-4848 grm. of substance gave 0-6278 grm. of carbonic acid gas and 0T397 grm. of 
water, corresponding to 35 ‘32 per cent, of carbon and 3-20 per cent, of hydrogen. 
04185 grm. gave, on boiling with water, 44-7 cub. centims. of nitrogen at 14°.C. and 
763 millims. bar. pressure =44*9 cub. centims., at 0° and 760 millims. bar. pressure 
=0-05642 grm., or 13-49 per cent. 
Calculated. 
Pound. 
G 6 
72 
35-65 
35-32 
H 6 
6 
2-97 
3-20 
n 2 
28 
13-86 
13-49 
s 
32 
15-83 
— 
o 4 
64 
31-69 
— 
202 
100-00 
For the estimation of the sulphuric acid Q‘558 grm. of substance, precipitated by 
chloride of barium, gave 0-647 grm. of sulphate of barium, corresponding to 48'76 per 
cent, of sulphuric acid. 
Calculated. 
a 
Pound. 
104 
51-49 
— 
98 
48-51 
48-76 
202 
100-00 
Sulphate of diazobenzol crystallizes in prisms, which readily dissolve in water, but are 
soluble with difficulty in absolute alcohol and insoluble in ether. The aqueous as well 
as the alcoholic solution is decomposed on boiling with evolution of gas. Exposed to 
the air, this compound attracts moisture very rapidly and becomes liquid, and gradually 
decomposes. Heated alone, it deflagrates feebly at about 100° C. 
Hydrobromate of Diazobenzol , G 6 H 4 N 2 , HBr. 
This compound is prepared by the action of bromine upon diazo-amidobenzol. 
When an ethereal solution of bromine is gradually added to a rather concentrated solu- 
tion of the diazo-amido-compound, each drop of the bromine-solution is seen to produce 
a precipitation of the hydrobromate of diazobenzol. When no more crystals are formed 
the precipitate is separated from the mother-liquor, washed with ether till quite white, 
and then dried over sulphuric acid. All these operations must be performed as speedily 
as possible, since the new compound is of a very unstable nature and rapidly decom- 
poses. 
Should it be found necessary to recrystallize the precipitate, it must be dissolved in 
the least possible quantity of cold alcohol, and ether added to the solution till no more 
precipitation takes place. 
