FROZEN SOLUTIONS. 



201 



doublets is present. This is probably caused by a change in the hydrate 

 at this dilution. This type of spectrum persisted through five more 

 dilute solutions, even when the solution contained only 1 part aqueous 

 solution to 1,000 parts acid. 



The effect of slowly cooling five of the acid solutions is seen in figures 

 101, 102, 103, 104, and 105. 



Very often combinations of acid and aqueous solution proved to be 

 unstable on freezing; consequently it was difficult to reproduce at 



NITRATE IN NITRIC ACID. 



+ 20 



-30 



-60" 



A 



-90 



-120' 



IV /\ A 



IV A 



-150" 



/T\ 



I'm 



/HA yn/i'l A f 



j\ 



-ISO' 



h , . , ll 



I I I 



t I I I I I I I I I I 



16|00 



leloo 



20|00 



.48J 



FIG. 101. 



NITRATE IN NITRIC ACID. 



-30 



-45 



-60 



A 



-90 



A A 



A 



-120 



A 



-150 



-180 



,/TV 



A. 



isloo 



18|00 



FIG. 102. 



i I 

 20|00 



.1 I I I 



.52 



