J. M. Ordway on Nitrates. 17 
he boiling is continued, oe soon commences 
_ black se of manganese is eet pn 
formation of peroxyd is ae: effecte hie & ee continued steam 
heat. 
Some liquid nitrate at 70° F. was found to have a density of 
18104, while the solid salt at 70° had the peace grayity 1: sa 
Mitrate of Nickel, Ni.$.H,.—Melts at 134°F. The liquid 
been cooled to 115°. It boils at 278°. 
When the boiling is continued the liquid remains clear till 
three equivalents of water are expelled. It then begins to thicken 
and parts with aci 
Nitrate of Cobalt, ‘Go. #.1,.—I had too little of this to deter- 
mine accurately the melting. and boiling points, bat they differ 
little from those of the nickel salt. 
Pernitrate of iro, ¥e+ 38H,.—Melts at 117° F. May remain 
liquid at 70°, after being strongly heated. It boils at 257° F. 
The e specific gravity of some in the liquid state at 70° F., was 
found to be 1:67 12, while the same solidified and gooled to 70°, 
Nitrate of Dhrcine, &r+3N Hf foc 7the salt melts at about 98° F 
It has been cooled to 68°. It boils at 258° 
Nitrate of Alumina, Xl + shH,. sag Hrs at 163° F., can be cooled 
to 147$°, and boils at 273° 
Nitrate of Uranium, 68 H,.—This beautiful salt melts at 189°. 
It may remain Ii uid at 115°. It begins to boil at 245°. 
When the boiling was continued, the stuff remained thin and 
clear till about four equivalents of water and a little of the acid 
passed off. The residue gave with water a solution which was 
turbid at first but soon became clear. Some heat was evolved 
during the solution. 
Nitrate of Copper.—W hen nitrate of co ri wr crystallizes at a low 
temperature, it forms a pale blue salt havmg the composition 
OuNH,. ese crystals are not permanent in hot weather, for 
at 794° F. they break up into a liquid and erystals of the trihy- 
drate. To make the whole liquid requires a heat above 2a9" 
and so the pale crystals have no defimte soli idifying point.* 
TRIHYDRATES. 
_ Nitrate of Copper, bu H,.—This is the formula of the orratals 
which form above 793° F. They have bys the same shape 
the sexhydrate sometimes assum are deep blue i. 
permanent in every state of the air. Pa composition is errone- 
ously given in some books as uN H,,— aed the 
Bs ution of npc of copper is sometimes sold, standing at 55°B, As a 
ey saturated at 50° F. has just this strength, it is not strange that the maker 
nds his et carboys broken by huge masses of pale crystals. 
X%XVIL, No. 1869. 
