72 



WORK OF J. N. PEARCE. 



ingly greater difference between the observed and calculated lowerings. The amount 

 of water combined with the salt increases regularly from 0.05 normal to the most con- 

 centrated solution, as shown by fig. 27. The hydration per molecule decreases 

 rapidly in the most dilute solutions, and approaches a constant value at 0.25 normal. 

 For the curve for hydrates, see fig. 26. 



70 



COBALT NITRATE. 



Cobalt nitrate, like cobalt chloride, crystallizes with G molecules of water, and 

 we should expect it to have hydrating power of the same order of magnitude. The 

 data given in table 55 show that such is the case. What has been said regarding 



cobalt chloride applies equally well to 

 the nitrate. 



The curves for the values of H and 

 M are found in figs. 28 and 29, respec- 

 tively. 



60 



40 



30- 



20 



Co(N0 3 ) 2 



Cu(NO"jT 



s 



0.10.25 0.5 0.75 1~ 

 Concentration 

 Fig. 28. 



1.5 



0.10.25 0.5 0.75 1. 1.5 



Concentration 

 Fig. 29. 



Table 55. Cobalt Nitrate Data for Freezing-point and Conductivity Measurements, 



Specific Gravity, and Hydrates. 



