G. S. Jamieson — Determination of Hydrazine. 353 



Determinations of hydrazine in the sparingly soluble double 

 sulphates of zinc, cobalt, nickel, and cadmium were made in 

 order to test the method further. The double salts were pre- 

 pared by mixing hot solutions of the component sulphates in 

 the presence of a little sulphuric acid, and after digesting for 

 some time on the steam-bath, the crystalline products were 

 filtered off by suction, washed with cold water and dried at 

 100° C. The titrations were carried out in the same way as 

 described above in the case of the simple sulphate. It was 

 observed that the nickel salt reacted very slowly, apparently 

 on account of difficult solubility, while the other compounds 

 were titrated about as readily as hydrazine sulphate alone. 



The following results were obtained : 



Substance 



KI0 3 used 



N 2 H 4 found 



Calculated 



ZnS0 4 (N,HJ,H,S0 1 



•11635 



43'2 CC 



19-83$ 



19-81$ 



it 



0880 



32-6 



19-77 



a 



CdS0 4 (N 2 H 4 ) s .H 2 S0 4 



1591 



5T25 



17-21 



17-29 



It 



1396 



45-10 



17-25 



a 



NiSO,(N,H 4 ) 1 .H J SO, 



0692 



26-30 



20-29 



20-23 



a 



0890 



33-80 



20*28 



a 



CoS0 4 (N,HJ,.H,SO, 



1308 



49 20 



20-09 



20-20 



a 



insci 



so-Tn 



90-09 



a 



Sheffield Scientific School, 



New Haven, Conn., February, 1912. 



