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Mol. pCt. Ag NOs. Commencement of Solidification. 
GOW ee dat Ss Shee 
BOs Mer eee TELS 
Ob bee becomen TOA 
Okken er roster tete EBS 
Ort wae ks EGE 
54 Ge 
53 85° 
52 81°.6 
DON elas tae eel es ORG 
BEEN Ve den Te Red 
An les 
ALB VAS eo Aa ODS 0 
ROD TE Werkte weken LOO. 
EBEN A. EEE 5 
re mt oe 
Ditmas ese OE EDE 
Ie EA nt WiC. 
VE ee ak 2062 
The graphie illustration (see figure) gives a clearer view. 
The points of intersection C and D of the doublesalt line with 
the two descending branches of the meltingpoint line cannot be 
readily determined, as both the lines A C and 2D continue far 
beyond those points. For instance, the mixture with 47 mol. per 
cent of Ag NOs commences to solidify at 85°, crystals being deposited 
which are heavier than the melt. On lowering the temperature to 
below 80°, the crystals continue to form until all at once a large 
quantity of double salt separates and the temperature rises to 82°.8. 
The temperature at which this sudden separation takes place is not 
the same in every experiment; sometimes this only commences at 
68°. The same takes place with mixtures containing more than 50 
mol. per cent of Ag NOs. From the mixture with 53 mol. per cent 
of Ag NO,, crystals begin to form at 83°.5; these are lighter than 
the melt. Sometimes the formation of them may continue down to 
75° or lower until all at once a large quantity of doublesalt crystals 
is deposited and the temperature goes up to 82°.8. 
The mixture with 50 mol. per cent of AgNO; deposits, from the 
commencement, crystals different from the two first. The erystals 
are of about the same density as the melt. In this mixture the first 
crystals separate at 82°8, or if supercooling takes place the tempe- 
rature goes up to 82°8, which is the melting point of the double 
salt, as soon as crystals are deposited, 
