OF PALLADIUM AND PLATINUM. 
305 
The formula deducible from these analyses is Pt Cl N 2 H 8 O s . From this the nume- 
rical results should be as follows : — 
One equivalent of platinum = 
98-8 
50-83 
One equivalent of chlorine = 
354 
18-21 
Two equivalents of nitrogen = 
28-2 
14-51 
Eight equivalents of hydrogen = 
8-0 
4-11 
Three equivalents of oxygen = 
24-0 
12-34 
194-4 10000 
By the application of a gentle heat, some water, apparently of hydration, may be sepa- 
rated from the substance, it however does not exceed one equivalent ; when dry, 
therefore, it probably consists of Pt Cl N 2 H 7 0 2 . 
The relation between this formula and that of the brown substance last de- 
scribed, is exceedingly remarkable, for the above may be considered as consisting of 
(Pt0 2 + NH 3 ) +CINH 4 , when dry differing from the brown substance in con- 
taining twice as much sal-ammoniac ; and this relation is supported by the circum- 
stance that by prolonged digestion in a solution of sal-ammoniac, the brown sub- 
stance may be converted into this white substance. 
This body becomes remarkably of interest, inasmuch as the compounds which it 
forms with acids are found to be identical with the interesting class of salts recently 
described by Gros, and that this substance is indeed the compound base which Gros 
considers to be united with the acids in the bodies which he described. The formula 
which he assigns to the base he hypothetically assumed was Pt Cl N 2 II 6 O, identical 
with that of the substance just described, with the exception of 2 aq, the separation 
of which is rendered difficult by the facility with which the body is decomposed. I 
shall hereafter, have occasion to notice the influence which our thus finding Gros’s 
base in the present series must exercise on the views which he put forward, but for 
the present I shall pass to the additional experimental matter. 
E. If, in place of precipitating the ammoniacal solution in the cold by alcohol, it 
be boiled violently so as to expel all the excess of ammonia, a quantity of the body 
last described falls down mixed with another of a pale brick-red colour. To obtain 
this last pure, the solution must be evaporated rapidly with ebullition to perfect dry- 
ness. If then any particles of white or yellow still remain, the mass must be mixed 
up with more water and again boiled until ultimately a pale brick-red, or a lively 
flesb-red powder remains behind. 
The liquor obtained by washing contains much sal-ammoniac. 
This powder when heated gives off water, sal-ammoniac and ammonia, and leaves 
metallic platinum. Boiled in water of ammonia it regenerates Gros’s base. When 
boiled in muriatic acid it produces a yellow solution and a white powder, and by 
boiling in a solution of sal-ammoniac the muriatic salt of Gros’s base. 
2 R 
MDCCCXLII. 
