OF NICKEL. 339 



1 atom acetic acid . 6-25 

 1 atom protoxide of nickel 4-25 

 5 atoms water . 5-625 



16-125 



9. Oxalate of nickel. This salt was obtained Oxalate > 

 by mixing together solutions of sulphate of 

 nickel and oxalate of ammonia in the atomic 

 proportions. For some minutes the mixture re- 

 tained its transparency, but by degrees it be- 

 came opaque, and oxalate of nickel was slowly 

 deposited. Very nearly the whole oxalic acid 

 and oxide of nickel were deposited ; only traces 

 of them could be detected in the supernatant 

 liquid. The oxalate of nickel, when well washed 

 and dried in the air, was a light green powder 

 destitute of taste, and insoluble in water. 



20 grains of this salt when heated on the sand 

 bath lost 1 *66 grains. It was now exposed to a 

 red heat till thoroughly calcined. There re- 

 mained a dark brown powder which did not 

 effervesce nor dissolve in cold nitric acid, 

 though a solution was slowly effected by the 

 assistance of heat : hence, it was peroxide of 

 nickel. It weighed 7 grains, equivalent to 6*263 

 grains of protoxide of nickel. The constituents 

 of the salt from this experiment, were 



Oxalic acid 6*631 or 4-5 



Protoxide of nickel 6-263 - 4-25 

 Water 7'106 - 4-822 



20-000 



ri 



