on solutions of the Metals, 333 
With sulphuric acid it gave off sulphurous acid in large quantity, By 
 wlution of caustic potash et was euveticd into a eign gran Solubhe 
_ tubstance.* By boiling with caustic potash, it gave black oxyd of cop- 
A portion, dried in vacuo, over sulphuric acid, gave off considera- 
water, on heating in a closed tube. It was found to contain no 
alkali, and no acetic acid. 
| For analysis, the salt was boiled with chlorine water until it dissolved, 
the sulphuric acid precipitated by chlorid of barium, the excess of chlorid 
barium by sulphuric acid, and the oxyd of copper, at the boiling point, 
by caustic potash. 
: 12266 grms, substance gave 1:0341 sulphate of baryta and 0°6975 
d of eo 
. ow sail Calculated. Found. 
7 2Cu0, 794 57°37 56°86 
: S02, 32° 23°12 23°15 
3HO, 27° 19°51 
138°4 100-00 
The salt is very soluble in sulphurous acid, to a green solution, The 
latter, by standing, deposits the red sulphite. Acetic acid has a precisely 
‘Similar effect. In preparing the salt, therefore, the solution of acetate 
Copper must be neutral and the sulphurous acid added in small quantity, 
Iftoo much acid be added, the precipitate will be redissolved, even before 
® solution smells of sulphurous acid. ; 
The salt appears to be hitherto undescribed. The only mention I 
tan find of anything similar is in a paper on the sulphites, by Bottinger. 
Bottinger,t by mixing a solution of sulphate of copper with sulphite of 
am 
a Gs sali as a ge 
aoneee 
mMonia containing but a small quantity of free sulphurous acid, ob- 
ined a dirty greenish-yellow precipitate, which, on the addition of a 
little sulphurous acid, was rapid!y and easily converted into u 
me color of the two substances varied considerably from each ; 
That obtained by means of sulpbite of ammonia was brownish-yellow, 
mith little or no greenish tinge. That prepared from acetate of copper 
Was of a much brighter yellow, with a decided tinge of green. Bottin- 
S salt, however, gave precisely the same reactions as mine. ] 
Stong acids it gave off sulphurous acid in large quantity. With caustic 
Potash it became bright green. By boiling with caustic potash it became 
and gave no smell of ammonia. The two salts, therefore, are no 
identical, 
UL Action of Red Selenium on the solutions of Copper, Silver and Lead. 
1. Without the presence of reducing agents.—Red selenium, left four 
days in solutions a sulphate and acetate of copper, still remained red, 
thowing that it had not combined with copper. The same, boiled with 
* The green i bably, to the presence of a little hydrated sub- 
Sard of eopper, t the yellow enlor of which, with the blag of the iodenhad cited, 
eve 
t Ann. der Chem. u. Pharm., li, 410. 
CR Sy ee ee eee gree 
