741 
1908-9.] The Atomic Weight of Platinum. 
work was finished. Parts of experiments Nos. 5 and 7 are wanting, as 
these were lost by accident. The atomic weight values for chlorine, 
silver and potassium used in these calculations were those given above. 
Table II. — Results of the Analysis of Potassium Chloroplatinate. 
No. of 
Experi- 
ment. 
Prepar 
K 2 PtCl 6 . 
ation. 
Silver. 
Weight 
of 
K 2 PtCl 6 
in 
vacuum. 
Weight 
of Pt in 
vacuum. 
Weight 
of 
4AgCl 
in 
vacuum. 
Weight 
of 
2AgCl 
in 
vacuum . 
Weight 
of 4Ag in 
vacuum. 
Weight 
of 2Ag 
in 
vacuum. 
1 
I. 
II. 
1-43605 
0-57667 
1-69324 
0-84690 
1-27475 
0-63722 
2 
5) 
I. 
1-69914 
0-68226 
2-00402 
1-00172 
1-50834 
0-75401 
3 
55 
55 
2-11830 
0-85062 
2-49836 
1-24894 
1-88046 
0-93993 
4 
II. 
55 
2-49734 
1-00287 
2-94462 
1-47249 
2-21626 
1-10841 
5 
)) 
II. 
• • • 
0-86012 
• • • 
1-26271 
... 
0-95030 
6 
55 
55 
2-20619 
0-88588 
2-60135 
1-30106 
1-95842 
0-97909 
7 
III. 
III. 
1-70600 
0-68486 
2-01201 
1-00580 
... 
... 
8 
55 
55 
1 -74397 
0-70018 
2-05691 
1-02820 
1-54816 
0-77402 
9 
55 
II. 
2-06137 
0-82789 
2-43096 
1-21526 
1-82982 
0-91481 
10 
> 
HH 
55 
2-34095 
0-93991 
2-76105 
1-38034 
2-07759 
1-03868 
11 
55 
55 
1-54787 
0-62150 
1-82560 
0-91266 
1-37391 
0-68702 
12 
55 
III. 
1-95944 
0-78694 
2-31070 
1-15522 
1-73902 
0-86967 
18 
55 
55 
2-28366 
0-91697 
2-69304 
1-34636 
2-02640 
1-01338 
24 
55 
II. 
2-27441 
0-91320 
2-68244 
1-34093 
2-01870 
1-00924 
Table III. — Ratios obtained from the Analysis of Potassium Chloroplatinate. 
Comparison of Platinum with Potassium Chloroplatinate and with Silver 
Chloride. 
Experiment. 
q-H 
O 
aiOu 
O 
Pm O 
i— H 
Atomic Weight 
of Platinum. 
Parts of Pt = 
100-00 parts of 
. 4AgCl. 
Atomic Weight 
of Platinum. 
Parts of Pt = 
100-00 parts of 
2AgCl. 
Atomic Weight 
of Platinum. 
pi o 
P-i ^ . 
to ; 
tad P^O 
-e o 
d i— i 
Pn II 
Atomic Weight 
of Platinum. 
3 ° 
TS go 
PH IS . 
C+H O 
o o <1 
OQ O ^ 
72 2 
a <— 
Ph || 
Atomic Weight 
of Platinum. 
1 
67-103 
195-25 
34-057 
195-27 
68-092 
195-20 
84-811 
195-29 
169-57 
195-13 
2 
67-094 
195-22 
34-045 
195-19 
68-109 
195-25 
84-787 
195-15 
169-62 
195-29 
3 
67T01 
195-24 
34-047 
195-21 
68-107 
195-25 
84-788 
195T6 
169-61 
195-25 
4 
67-105 
195-26 
34-058 
195-27 
68-107 
195-24 
84-810 
195-29 
169-60 
195-16 
5 
67-118 
195-29 
0 • • 
... 
68T17 
19527 
... 
... 
169-61 
195-25 
6 
67-096 
195-23 
34-055 
195-25 
68-089 
195-19 
84-810 
195-28 
169-57 
195T4 
7 
67-068 
195-15 
34-039 
195T6 
68-091 
195*20 
84-791 
195-18 
169-62 
195-28 
8 
67-081 
195T8 
34-040 
195-17 
68-098 
195-22 
84-786 
195-15 
169-61 
195-26 
9 
67-118 
195-29 
34-056 
195-26 
68-125 
19529 
84-797 
195-21 
169-62 
195-29 
10 
67-087 
195-20 
34-042 
195-18 
68-093 
195-20 
84-785 
195-14 
169-59 
195-21 
11 
67-090 
195-21 
34044 
195-19 
68-098 
195-22 
84-787 
195T5 
169-60 
195-23 
12 
67T16 
195-29 
34-056 
195-26 
68T20 
195-28 
84-799 
195-22 
169-62 
195-28 
18 
67-094 
195-22 
34-050 
195-22 
68-107 
195-25 
84-799 
195-22 
169-62 
195-28 
24 
67-087 
195-20 
34-045 
195-19 
68-102 
195-23 
84-789 
195T8 
169-62 
195-27 
Average 
67-097 
195-23 
34-049 
195-21 
68-104 
195-24 
84-795 
195-20 
169-61 
195-24 
