SALTS 



1 atom nitric acid . 6-75 



1 atom protoxide of nickel 4-25 

 5 atoms water . . 5-625 



16-625 



Carbonate, 3. Carbonate of nickel. This salt is easily 

 obtained by precipitating a solution of sulphate 

 of nickel by carbonate of soda, collecting the 

 precipitate upon a filter, and allowing it to dry 

 in the open air, after having been thoroughly 

 washed. It is a light green tasteless powder, 

 insoluble in water ; but dissolving with effer- 

 vescence in acids. 20 grains of it, when expos- 

 ed to the heat of a spirit lamp in a platinum 

 crucible, give out water and carbonic acid ; 

 and a black powder remains, weighing 10*58 

 grains, equivalent to 9*466 grains protoxide of 

 nickel. Hence, the constituents of the salt are 



Carbonic acid 6-125 or 2*75 



Protoxide of nickel 9-466 - 4-25 

 Water 4-409 - 3-385 



20-000 



The last column, giving us the ratios of the 

 constituents, shows that the composition of the 

 salt is 



1 atom carbonic acid . 2-75 

 1 atom protoxide of nickel 4*25 

 3 atoms water . 3-375 



10-375 



