OF PALLADIUM AND PLATINUM. 
289 
A. Prepared by dilution with water. 
39*467 grains were heated over a spirit lamp cautiously until all water had been 
given off. The dry mass, which had become much darker in colour, weighed 35*994 
grains, or 91*2 per cent,, having lost 8*80 of water. 
The dry powder was fused with carbonate of soda, and the metallic palladium 
collected precisely as described in the preceding article. It weighed 29*215 grains, 
or 73*68 per cent. 
By the addition of nitrate of barytes the sulphuric acid was determined ; it 
amounted to 2*408 grains, or 6*11 per cent. 
B. Prepared by the addition of potash. 
The method of analysis was precisely as in the foregoing instance. 
23*645 grains of material gave when dried 21*670 grains, or 91*64 per cent., having 
lost 8*36 of water. 
This residue gave 17‘379 grains of palladium, being 73*49 per cent. ; and then 
4*569 grains of sulphate of barytes, being 19*36 per cent., containing 6*65 of sulphuric 
acid. 
C. A portion of the same specimen having been exposed to the air for some time 
was analysed. 
27*443 grains gave when dried 23*722 grains, or 86*45 per cent., having lost 13*55 
of water. 
This residue was ignited with carbonate of ammonia. It left 19*215 grains of 
metallic palladium, equivalent to 70*02 per cent. 
This basic salt had, therefore, by exposure to the air, regained a quantity of water 
of which it had been deprived by the high temperature of the stove in which the 
drying of the precipitates had been effected. 
D. Prepared by ammonia, not added in excess, and dried at about 150° Fahr. 
I. 47*072 grains of material gave, by a temperature near, but still below, redness 
in the dark, 40*361 grains of dry substance, being 85*74 per cent. It had thus lost 
14*26 of water. 
By fusion with carbonate of soda, and treatment in the usual manner, were ob- 
tained 32*444 grains of metallic palladium, and 9*800 grains of sulphate of barytes. 
These weights indicate 68*91 per cent, of metal, and 7' 15 of sulphuric acid. 
II. 24*780 grains of this specimen were heated until all water was given off ; it 
then weighed 21*159 grains, having lost 14*58 per cent. The dry salt was then ex- 
posed to a damp atmosphere for twenty-four hours ; it did not increase very sensibly 
in weight. This basic sulphate has, therefore, no power to reassume the hydrated 
condition, having once been fully dried. 
This dry material was fused with carbonate of soda, and the metal and sulphuric 
acid determined by the usual methods. It gave 16*977 grains of palladium, or 69*47 
per cent., and 4*275 grains of sulphate of barytes, indicating 6*94 of sulphuric acid 
per cent. 
2 p 
MDCCCXLII. 
