
ITS PRODUCTS OF DECOMPOSITION. 67 
The change which takes place in this manner is not always complete, and the 
granular crystals are often mixed with unchanged yellow powder. When the 
chloride of platinum is added to a more dilute solution of hydrochlorate of co- 
deine, precipitation does not take place immediately, but in a short time the salt 
is deposited in minute tufts of silky needles. The salt is soluble in boiling water, 
and is deposited on cooling partly in grains, partly as a powder. By this process, 
however, it is partially changed ; and I have ascertained that by ebullition, with 
excess of chloride of platinum, it is completely decomposed. I have not as yet, 
however, followed up this observation. I at first attempted to purify the salt by 
solution in water and alcohol, in which it is also soluble; and a number of ana- 
lyses were made, which gave extremely contradictory results; but by precipita- 
tion in the cold, and without excess of platinum, sufficiently uniform results were 
obtained. 
When dried at 212°, the salt retains an equivalent of water, which is expelled 
at 250°, but not without occasioning partial decomposition of the substance, 
which evolves acid, and acquires a brownish colour. The following are the re- 
sults of analysis :— 
F 7°240 grains of platinum salt, dried at 212°, gave 
I. <11:072 ... of carbonic acid, and 
2°925 ... water. 
9°394 crains of platinum salt gave 
II. {14593 .,. of carbonic acid, and 
3912 ... of water. 
7-648 grains of platinum salt gave 
III. < 11:694 ... of carbonic acid, and 
3450 ... of water. 
6°665 grains of platinum salt gave 
IV. ¢ 10-230 ... of carbonic acid, and 
2835 ... of water. 
7383 grains of platinum salt gave 
Vv 11°372 ... of carbonic acid, and 
3°304 ... of water. 
7-247 grains ana salt ifn 1-400 grains pe =19°31 ar cent, 
10-030 1-920 ’ =19-14 
9°775 dis ae 1:850 ads =18-92 
10:471 ae ah 2:020 Seto =19°32 
8-428 at 508 1-600 Sot =18-98 
6790 532 les 1:296 4 =19-08 
5052 Tho re 0:960 bi =19-00 
I. II. II. IV. Vie VI. Vil. 
Carbon, ; 41-70 42°36 41-70 41°80 42-00 
Hydrogen, . 4:49 4-62 5:01 4-72 4:97 
Nitrogen, 4 ees See nae “ce 33 
Oxygen, 
Chlorine, 
Platinum, . 1931 1914 1892 1932 1898 19:08 19-00 
