Chemical Science. 621 



in water, which becomes of an intense blue colour. If strongly 

 heated, it melts and emits ammonia, water, and sulphite of ammo- 

 nia ; the remainder is of a brownish colour, and consists of metallic 

 copper and undecomposed sulphate of copper. 



A similar compound is obtained from sulphate of copper and the 

 solution of ammonia ; it differs, however, from the above, inasmuch 

 as it consists, according to Berzelius, of 1 atom of sulphate, 1 atom 

 of water, and 4 atoms of ammonia. 



Ammonia and Sulphate of Nickel. The sulphate absorbs ammo- 

 nia very rapidly, and under much evolution of heat ; it is a white 

 powder, with a slight violet hue; 0.481 parts of salt, combined 

 with 0.317 parts of ammonia, or 100 parts of the former with 

 65.91 of the latter, equal to 1 atom of salt, and 6 atoms of am- 

 monia. It is soluble in water, with a deposit of hydrate of the 

 oxide of nickel, and by a gentle heat emits ammonia, sulphite of 

 ammonia, and water. 



The combination of Ammonia with Sulphate of Cobalt is very 

 rapid ; the compound forms a white powder, with a feeble red hue ; 

 0.543 parts of salt unite with 0.361 parts of ammonia, or 100 

 parts of the former with 66.48 of the latter, which corresponds 

 to 1 atom of salt and 6 atoms of ammonia, or 100 parts of the 

 sulphate and 66.33 of ammonia. It is soluble in water, to which it 

 imparts a reddish tint, and forms a deposit of the hydrate of oxide 

 of cobalt. 



Ammonia and Sulphate of Cadmium unite very rapidly, and 

 with much evolution of heat j the compound is a white powder, con- 

 sisting of 100 parts of the sulphate with 48.69 of ammonia, equal to 

 1 atom of the former, and 6 atoms of the latter, or 100 parts of sul- 

 phate with 49.56 of ammonia. It is not quite soluble in water, and 

 deposits much oxide of cadmium ; on being heated, ammonia and 

 a small quantity of sulphite of ammonia are emitted. 



Ammonia and Sulphate of Silver combine very slowly, forming a 

 white powder, of which 100 parts consist of sulphate, and 11.82 of 

 ammonia, which corresponds to 1 atom of the former, and 2 atoms of 

 the latter, equal to 100 parts of salt, and 10.99 of ammonia. It is 

 completely soluble in water, and, on being heated, emits ammonia 

 and sulphite of ammonia. 



Ammonia and Nitrate of Silver combine very rapidly, with 

 much evolution of heat ; the nitrate first melts, and then changes into 

 a white mass, which is perfectly soluble in water, and, on being 

 heated, evolves ammonia. 10.12 parts of the nitrate take up 0.298 

 parts of ammonia, which corresponds to 100 parts of the former, 

 and 29.55 parts of the latter, or 1 atom of nitrate, and 6 atoms of 

 ammonia. 



The anhydrous sulphate of magnesia, the nitrates of soda and of 

 baryta, the phosphate of copper, and bichromate of potash, could not 

 be made to combine with ammonia. 



Compounds of Chlorides and Ammonia are very similar. The ab- 



