Ammonio-Copper Sulphate

Characters and Tests.—Heavy, white, glistening powder, or in translucent masses resembling porcelain. Completely volatile at 400° F. Sublimed in a test-tube, it condenses in brilliant octahedral or triangular crystals. Its aqueous solution furnishes a yellow precipitate (silver arsenite) with silver ammonio-nitrate, and a green precipitate (copper arsenite) with copper ammonio-sulphate. These precipitates are soluble in ammonia and in nitric acid. 

Characters and Tests.—Blue crystalline salt, in oblique prisms, soluble in water, forming a pale blue solution which strongly reddens blue litmus. The aqueous solution gives with barium chloride a white precipitate (barium sulphate), insoluble in hydrochloric acid, showing the salt to be a sid-phate and with potassium ferrocyanide a maroon-red precipitate, indicating the presence of copper (cupric ferrocyanide). If an aqueous solution of the salt be mixed with twice its volume of chlorine water, to peroxidize any iron that may be present, and solution of ammonia be added, the precipitate (cupric hydrate) formed by the first addition of the ammonia will be dissolved by a further and sufficient addition of the alkali, and a violet blue solution (copper ammonio-sulphate) will be produced, leaving nothing un ssolved unless iron be present, in which case a reddish-brown precipitate will be left. 

When diluted with four times its volume of distilled water, it should give no precipitate with lime-water, showing the absence of ammonium carbonate no precipitate with ammonium oxalate, indicating the absence of calcium no precipitate with ammonium sulphide, showing the absence of iron and no precipitate with copper ammonio-sulphate, proving the absence of ammonium sulphide. Liquor Ammonias fortior acidified with nitric acid should not be rendered turbid by silver nitrate, indicating the absence of chlorine, or by barium chloride, showing that it is free from sulphate. 

Ammonlacal sulohate of copper See ammonio-sulphate of cooper. 

Ammonio-sulphate of copper 4090 (N2K Cu)S04 Ammoniacat sulphate of copper. 

Solution of Amznonio-Sul-phate of Copper, Dissolve 1 drachm of tho ammonio-sulphate in 1 pint water, and filter. This is stimulant and detergent. Ap-pbed as a lotion to indolent ulcers and, largely diluted, to remove specks on tho cornea. Also used as a test for arsenical compounds, with which it throws down a groen precipitate. 

Blue Fire for Stage Efibct. 15 parte of Bulphur, 15 parte sulphate of po-taaia 15 ports ammonio-sulphate of copper, 27 parts nitre, and 28 parte chlorate of potassa. The blue is mode darker or lighter by mcreas-Ing or diminishing tho potasso and copper ingredients. This is Marchand s preparation. 

It is interesting to note that, if freshly precipitated and thoroughly washed Cu(OH)2 is treated with ammonia, a similar deep blue solution is obtained, but in this case the negative ions are hydroxyl instead of sulphate. Ammonio-copper hydroxide is very soluble and very highly ionized, and the solution compares in basic strength with one of sodium hydroxide. 

Preparation 3 illustrated the formation of a double salt, ammonium copper sulphate, (NH SCh-CuSCh-OI O. In the double salt, ammonium plays the part of a positive radical. In the present preparation ammonia plays an altogether different role. It does not possess a primary valence, and it enters into a molecular compound with the salt by virtue only of a secondary valence. In fact, the ammonia in this preparation is held in the same sort of a combination as the water in the hydrate CuS04-5H20. The molecules of ammonia would appear to be bound to the copper rather than to the sulphate radical, because when the salt is dissolved in water the four ammonia molecules remain in combination with the copper as the complex ion Cu(NH3)4++, while the sulphate radical appears as the ordinary SO4 ion. Thus we might say that this salt is the sulphate of the ammonio-copper complex. (Cf. Ammoniates, page 118.)... 

What is an ammoniate Give the formulas of the ammonio-ions of copper, silver, zinc, and cadmium. How can crystallized ammonio-copper sulphate be prepared How would you make a solution of ammonio-copper hydroxide What is the alkaline strength of such a solution ... 

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