368 
DR. A. W. HOFMANN’S RESEARCHES INTO THE 
The formula 
Ci6 H2oNCl,PtCl2=<; 
C4 h; 
C 4 Hs 
C 4 H 5 
C 4 
!>nci, Pt CI2 
requires the following values, which I collate with the experimental numbers. 
16 equivs. of Carbon 
20 equivs. of Hydrogen 
! equiv. of Nitrogen . 
3 equivs. of Chlorine . 
1 equiv. of Platinum . 
1 equiv. of Platinum- salt 
96 
20 
14 
106-5 
98-68 
Theory. 
-A 
28- 63 
5*95 
4-20 
31-78 
29- 44 
Mean of Experiment. 
28-89 
6-08 
29-27 
335-18 100-00 
Gold-Salt. — It is formed by mixing the solution of the two chlorides, when a 
lemon-yellow precipitate takes place, which is but slightly soluble in cold water or 
hydrochloric acid. Before analysis it was recrystallized from boiling water. I was 
satisfied with a determination of the metal in this compound. 
I. 0-2555 grm. of gold-salt gave 0-1075 grm. of gold. 
II. 0-4344 grm. of gold-salt gave 0-1822 grm. of gold. 
The formula 
H 5 ] 
C4 H5 
C 4 H- 
C4 U, 
yNCl, Au CI 3 
requires the following values 
Theory. 
A 
Mean of Experiment. 
1 equiv. of Chloride of Tetrethylammonium 165*50 
3 equivs. of Chlorine 1 06*50 
1 equiv. of Gold 196*66 
35-32 
22-72 
41-96 
42-00 
1 equiv. of Gold-salt 468*66 100*00 
Mercury-Salts. — a. Chlorine- Compound. — On adding an excess of protochloride of 
mercury to a nearly neutral solution of the chloride, a beautiful crystalline white 
precipitate is formed, which is soluble in water and in hydrochloric acid, especially 
on ebullition. From the boiling solution it is deposited on cooling in plates of a 
greasy appearance. The analysis refers to two different preparations, the same 
specimen being used for I. and II. The mercury was determined as protosulphide. 
I. 0-4595 grm. of substance gave 0-3147 grm. of protosulphide of mercury. 
II. 0’3960 grm. of substance gave 0-4020 grin, of chloride of silver. 
III. 0*5530 grm. of substance gave 0*5580 grm. of chloride of silver. 
