OF NICKEL. 337 



2 atoms arsenic acid 1 5-5 



1 atom oxide of nickel 4-2.) 



1 atoms water 1 1 -25 



31 



7. Chromate of nickel. This salt was obtain- 

 ed by mixing together solutions of chromate of 

 potash and sulphate of nickel. No precipitate 

 appears at first, but a reddish brown powder gra- 

 dually falls ; and the precipitate is increased by 

 evaporating the liquid. This deposite, when 

 washed and dried, is rather a beautiful reddish 

 brown powder, destitute of taste, and not affect- 

 ing vegetable blues. 15'2 grains of it, when 

 heated to redness, assumed an olive green colour, 

 and lost 4-45 grains of weight. Hence it was a 

 compound of 



1 atom chromic acid 6-5 



1 atom oxide of nickel 4-25 

 4 atoms water 4-5 



15-25 



8. Acetate of nickel. This salt was obtained Acetate, 

 by dissolving carbonate of nickel in very strong 

 acetic acid. The carbonate dissolved rapidly 

 with a strong effervescence. The saturated so- 

 lution is dark green. When set aside, it gra- 

 dually deposites acetate of nickel in light green 

 crystals. The form of these crystals is a rhom- 



Voi, II. Y 



