OF PALLADIUM AND PLATINUM. 
285 
This body may be considered as a compound of ammonia-chloride with ammonia- 
oxide of palladium, thus 2 (Pd Cl . N H 3 ) + Pd O . N H 3 , and its origin explained, 
by an atom of potash producing with three atoms of ammonia-chloride, it and chlo- 
ride of potassium, for 3 (Pd Cl . N H 3 ) and K O give Pd 3 Cl 2 O N 3 H 9 and K Cl. I 
shall, however, return to the notice of its rational constitution when the next sub- 
stance has been described. 
B. When the same kind of palladium liquid from which the brown red substance 
last noticed is prepared, is heated with an excess of solution of caustic potash in the 
cold, a whitish powder falls, which on drying, even by a very gentle heat, becomes 
dark olive-coloured. If it be boiled its colour changes to yellow, and is then found 
to be identical with the yellow crystalline body (Pd Cl . N H 3 ) which makes its ap- 
pearance under such various circumstances. This olive-coloured substance when 
heated evolves water and vapours of sal-ammoniac, leaving metallic palladium. Its 
analysis gave the following results : — 
12-224 grains gave, by fusion with carbonate of soda and decomposition by nitrate 
of silver, in the usual manner, 8’242 grains of metallic palladium, equivalent to 67'43 
per cent., and 5 939 grains of chloride of silver, being 48 - 48 per cent., containing 
1 1 - 96 per cent, of chlorine. 
12-113 grains, heated with oxide of copper as for an organic analysis, gave 2'423 
of water, being 20‘03 per cent., containing 2 - 22 per cent, of hydrogen. 
Hence the formula expressing the composition of this body appears to be 
Pd 4 Cl N O e H 6 , the numbers being 
Pd 4 
Cl 
N 
o 6 
H 6 
Theory. 
Experiment. 
= 2132 
67-34 
67.43 
= 35-4 
11-18 
11-96 
= 14-0 
4'43 4 
18-39 
= 48-0 
15-16 j 
= 6-0 
1-89 
222 
316-6 
100-00 
100-00 
I regret very much that the quantity of this substance at my disposal did not allow 
me to make a distinct nitrogen determination at the time of the above analyses, and 
the difficulty of procuring either this or the preceding (A. red brown) body quite 
free from the crystalline yellow substance being very great, I have not had a subse- 
quent opportunity. I shall however return to it, although I consider the arguments 
which might be brought forward in favour of the formula just now given to be very 
decisive for its reception : indeed no other formula that can reasonably explain the 
circumstances of the production of this body agrees with the numerical results of its 
analysis. 
