and Attached Water. 



451 



constituent which had the lowest of the two cryohydrate 

 temperatures. In these experiments I was careful to use 

 the salts in such proportion that recombination in integral 

 quantity was possible. In the series of experiments now to 

 be described, where ice has to be separated from a mixture 

 while the salts themselves remain in solution, we may, in 

 those cases at all events where no double decomposition is 

 possible, take equal weights of the salts, so as to compare 

 the results with those of fig. 1 ; and for this study I will 

 here confine myself principally to the two nitrates AgN0 3 

 and NH4NO3, because nitrates are especially free from ten- 

 dency to form double salts, and because the tracings of the 

 ice-separating temperatures of the individual salts are of 

 widely different range and character. 



§ 144. Separation of Ice from mixed Solutions of the Nitrates 

 of Silver and Ammonium. — The following are all 20 per cent, 

 solid. 



Sol. 1. Agists . . 



20 grms. "J 







NH 4 N0 3 . . 



10 „ 5- gave 



ice at —4*3, 



H 2 . . . 



120 „ j 





Sol. 2. AgN0 3 . . 



20 „ 1 





NH 4 N0 3 . . 



20 „ } „ 



„ -5-0. 



H 2 . . . 



160 „ j 





Sol. 3. AgN0 3 . . 



20 „ ) 





NH 4 N0 3 . 



30 „ } „ 



„ -5-5. 



H 2 . . 



200 „ j 





Sol. 4. AgN0 3 . 



10 „ ) 





NH 4 N0 3 . 



20 „ V „ 



„ -5-8. 



H 2 . . 



120 „ ) 





The following are all 3 



per cent, solid : — 





Sol. 5. AgNOa • 



30 grms. ^ 





NH 4 N0 3 . 



15 „ > gave ice at —6*8. 



H 2 . . 



• 105 „ ) 





Sol. 6. AgNO B . 



. 30 „ ) 





NH 4 N0 3 . 



• 30 „ \ „ 



„ -8-0. 



H 2 . . 



■ 140 „ ) 





Sol. 7. AgN0 3 . 



• 20 „ ) 





NH 4 N0 3 . 



• 30 „ [ „ 



„ -8-9. 



H 2 . . 



. 116-6,, ) 





Sol. 8. AgN0 3 . 



■ 20 „ 1 





NH 4 N0 3 . 



• 40 „ V „ 



„ -9-1. 



H 2 . . 



• 140 „ ) 





On comparing these 



results with those 



given in fig. 1 



(showing the ice-tracings 



for the separate salts, which are also 





2 H2 





