ACTION OF SULPHURIC ACID UPON THE AMIDES AND NITRILES. 
467 
analyst. The dilute aqueous solution was therefore boiled with carbonate of barium 
until entirely decomposed^ and the filtered liquid concentrated in a beaker. At a 
particular point of the evaporation, a quantity of sulphopropionate of barium appeared 
in small cubic grains, which caused so much “bumping” as to make it necessary to 
evaporate upon the water-bath. 
If the concentration be arrested before the deposition of these grains, and the liquid 
be set aside for twenty-four hours, it yields a plentiful crop of beautiful silky crystals, 
arranged in spherical groups. 
After another crystallization from hot water, in which the substance is moderately 
soluble, this salt is sufficiently pure. For analysis it was dried at 170°. 
0’3636grm. of substance gave 0’2940grm. of sulphate of barium. 
0'4960grm. of substance gave 0’2138grm. of carbonic acid and 0‘0672 water. 
The results of this analysis agree with the formula of sulphopropionate of barium, 
CelH.Ba,) S,0,„. 
Theory. Experiment. 
6 equivs. of Carbon . . 
36 
12-45 
1 1-75 
4 equivs. of Hydrogen . 
4 
1-38 
1-49 
2 equivs. of Barium . . 
. 137 
47-40 
47-52 
2 equivs. of Sulphur . . 
32 
11-07 
10 equivs. of Oxygen . . 
80 
27-70 
289 100-00 
Propyl-Series. 
From what has been already said, but few words are necessary on the preparation 
of disulphopropiolic and sulphobutyric acid. It may, however, be stated, that buty- 
ramide boils at 216°, and passes over at that temperature in drops which crystallize 
beautifully. It has the characteristic sweet taste of the other amides of the series, 
and, like them, it fumes slightly in the air when gently heated. 
Three parts of butyramide produce with two parts of fuming sulphuric acid a 
horny mass, which, after removal of the sulphuric acid and saturation with ammonia, 
yields a syrup wholly uncrystallizable. The ammonium-salts were converted into 
barium-salts, which also possess but feeble powers of crystallization. 
M. Redtenbacher has already pointed out how much the solubility in water of 
the barium-salts of the acids Cn2H„2 04 augments as the value of the coefficients pro- 
gressively increases. A similar increase of solubility is observed with the barium- 
salts of the series of conjugated acids which form the subject of this paper. The con- 
trast between the almost insoluble disulphometholate and the very soluble disulpho- 
propiolate of barium is very marked. 
MDCCCLVI. 3 Q 
