ee 
A&. 
ie 
k 
338 W. Gibbs and F. A. Genth 
1: 1 (over the base) = 110° 20’ a Bm 
O.. 1 = 124° 60’ 
0:8 = 108° 4! 
3 : 3 (over the base) = 135° 52’ et 
a =1°0161 
O : i (not observed) = 134° 33’ Ga ee 
The crystals are usually small and often very brilliant. The 
salt is readily soluble in hot water, and separates in small erys- 
tals on cooling. Chlorhydric acid throws it down from its solu- 
tion as a yellow crystalline powder; nitric acid also precipitates 
it, but sulphuric acid converts it into sulphate with more or le 
complete decomposition. The nitrate of Luteocobalt is anhy- 
drous, and has the formula 
6NHs3. CozOs, 3NOs 
as the following analyses show: 
0-1972 grs. gave 00880 grs. sulphate of cobalt == 16°98 per cent cobalt. 
02090 grs. “ 00998 grs.  “ es ies7 e 
16859 grs. “ 0°5151 grs. water = 5-27 per cent hydrogen. 
09126 gra, “ 04337 ers. “ = 5 “ “ , 
0°6242 gprs, gave 188 c. c. at 1195 C. and 772™™-40 at 11°-94—== 180°56 c. ¢. at 0 
and 760™™ = 36°33 per cent nitrogen. i 
07894 grs. gave 226 c.c. at 1895 C. and 766"™05 at 14° = 21329 c.c. at 0 
and 760™™ = 36°23 per cent nitrogen. 
The formula requires 
Eqs. Calculated. Mean. 
Cobalt . - 2 17 16°93 16°98 1689 
Hydrogen. . 18 518 5:27 527 6°28 
Nitrogen . . 9 3631 37:28 86:23 36:33 
_ Frémy and Rogojski deduce the same formula from very 
imperfect analyses. Heat decomposes the dry nitrate of Luteo- 
cobalt with a slight explosion, a black powder of an oxyd of 
cobalt remaining. It may be remarked that the oxygen aD 
hydrogen in this salt are exactly in the ratio to form water. 
OXALATE OF LUTEOCOBALT. 
When asolution of oxalate of ammonia is added to one of a 
soluble salt of Luteocobolt, a buff colored precipitate of fine 
les is thrown down, which is insoluble both in hot and cold 
water, but which readily dissolves in a solution of oxalic acid. 
From this solution the neutral oxalate crystallizes in beautiu 
prismatic i Reo having the color of the sulphate and chlorid. 
e crystals lose water like those of the other hydra- 
salts of Luteocobalt. The oxalate has the formula 
.6NH:.CO20:2, 8C20:4+4HO 
as the following analyses show: © 
Sore aa 
= 
gS ier ane Vay sang Oo oe, ORR EELS | 
ae 2 
+ a 
ses re je 2 2 
et eS eee ee ee gt 
