508 
DE. A. W. HOFMANN ON THE PHOSPHOEUS-BASES. 
dichloride of platinum, a very voluminous, pale-yeUow, slightly cr^'stalline precipitate is 
obtained, which is difficultly soluble in boiling water, and also in boiling concentrated 
hydrochloric acid. The acid solhtion deposits well-formed prismatic ciystals. The 
crystallization from concentrated hydrochloric acid is necessaiy to ensure the puiity of 
the product ; it appears that the direct precipitate contains an admixture which remains 
dissolved in the acid. Specimens of different preparation gave on analysis the following 
results : — 
I. 0-6817 grm. of platinum-salt gave 0-4220 grm. of carbonic acid and 0-2256 grm. of 
water. 
II. 0-8285 grm. of platinum-salt gave 0-5195 grm. of carbonic acid and 0-2890 grm. of 
water. 
III. 0-3658 grm. of platinum-salt, treated with hydrosulphuric acid, <?:c., gave 0-1257 
grm. of platinum. 
IV. 0-5005 grm. of platinum-salt, treated with hydrosulphuric acid, &c., gave 0-1716 
grm. of platinum. 
V. 0-8835 grm. of platinum-salt, treated in the same manner, gave 0-3069 grm. of 
platinum. 
The formula 
Cg H22 P N Pc 2 Clg = 
(C H V'^^2^5)3P 
Tj at 
~\ll 
H 3 N. 
CL,2PtCL 
requires 
Theory. 
A 
Experiment. 
A 
I. 
II. 
III. 
IV. 
V. 
Cg 
96 
16-74 
16-88 
17-10 
• 
H 22 
22 
3-84 
3-67 
3-87 
p 
31 
5-41 
N 
14 
2-44 
Pta 
197-4 
34-43 
34-28 
34-36 
Cle 
213 
37-14 
— 
573-4 
100-00 
o4 
- 1 o 
Some of the crystals, obtained on sloAvly cooling a boiling solution in concentrated 
hydrochloric acid, were sufficiently well-formed to enable Q. Sella to examine them 
crystallographically. He has communicated to me the folloiving description : — 
“ System trimetric : — Fig. GG. 
1 0 0, 1 1 0 = 59° 50' ; 0 0 1, 1 0 1 = 70° 38'. 
Forms observed : — 
10 0, 110, 101, 010 (Fig. 66 ). 
Angles. 
Caloiilated. Observed. 
100, 01 0 = 90 d 89° 40 
1 0 0, 1 1 0 = 59 50 59 55 
