358 IRON, NICKEL, COBALT, &c. 



tion into which this compound is capable of 



entering. 



SECT. II. 



- 



OF THE ATOMIC WEIGHT OF NICKEL. 



THE atomic weight of nickel and its protoxide 

 may be determined without much difficulty from 

 the sulphate, which I find to be a compound of 

 1 integrant particle of sulphuric acid, 1 inte- 

 grant particle of protoxide of nickel, arid 7 inte- 

 grant particles of water. This salt has a fine 

 grass green colour, and crystallizes in four-sided 

 rectangular prisms. Its taste is astringent, but 

 not strong, and it is very soluble in water. 

 sulphate i. 17-1^5 grains of the crystals of this salt 



of nickel TIT i -i i 



analyzed, were dissolved in water, and mixed with a solu- 

 tion of 13*25 grains of chloride of barium. A 

 double decomposition took place, and sulphate 

 of barytes precipitated. The clear residual li- 

 quor being tested by sulphate of soda and mu- 

 riate of barytes, was not affected by either, 

 showing that it contained neither barytes nor 

 sulphuric acid. It is obvious from this experi- 

 ment, that 17*125 grains of crystallized sulphate 

 of nickel contain just the quantity of sulphuric 

 acid necessary to saturate the barytes from 13-25 

 grains of chloride of barium ; that is to say, ex- 

 actly 5 grains of this acid. 



