SOLUBILITY OF SALTS IN WATER AT HIGH TEMPERATURES. 33 
Potassium bromide.—Melting point 699°. 
Temperature. 
Parts of salt in 100 parts 
of water. 
140 
120'9 in metal tube. 
181 
145-6 
Potassium iodide.— 
-Melting point 634°. 
Temperature. 
Parts of salt in 100 parts 
of water. 
124 
233-9 V 
133 
249'3 ( in glass 
144 
264-6 ( tube. 
175 
310-4 ) 
(See Plate 2.) 
These results, when expressed graphically, correspond in each case very nearly to 
a straight line. And when the four preceding salts are compared together they 
serve to illustrate very well the relation of solubility to fusibility. In Plate 2, 
iodide of potassium, the most easily fusible, is shown to be not only the most 
soluble at common temperatures, but its solubility increases at a more rapid rate 
than either of the others, which follow in succession. 
Potassium nitrate.—Melting point 339°. 
Two determinations of the solubility of this salt were done at 125°. At this 
temperature 100 parts of water dissolved— 
Exp. I. 495 ‘9 parts of salt, KN0 3 . 
Exp. II. 4927 
From the great solubility of the salt at higher temperatures, and the peculiar 
viscosity of the solution, in consequence of which it was difficult to separate it from 
the solid, no determinations of any value could be obtained in the experiments made 
at 180° and thereabouts. 
Silver nitrate.—Melting point 217°. 
Notwithstanding the extreme solubility of this compound, two pairs of concordant 
determinations were made. 
Temperature. 
Parts of salt dissolved in 100 parts 
of water. 
125 
133 
1622-5 1 • , , , 
1941-4 / in §’ lass tube - 
(See Plate 1.) 
F 
MDCCCLXXXIV. 
