A Comprehensive Treatise on Inorganic and Theoretical Chemistry

H8
3-65
8-65
PLATINUM 137
and hydrogen. H. Damianovich found that the rate of dissolution of platinum
in aqua regia decreases with absorbed gases in the order He, O2, N2- P. M. Niccoiini
2 discussed the odour of the element.
Ordinary platinum contains much occluded gas which is very difficult to remove.
A. Berliner 3 estimated that the metal contains roughly 80 vols, of occluded gas.
Platinum freed from occluded gases can be readily recharged with gas. L. Mond
and co-workers found that platinum foil at ordinary temp, gives off very little
gas, but at dull redness it gives up 0-4 times its vol. of gas—chiefly carbon dioxide.
33. Delachanal observed :
144 grms. I*t .
146 grms. Pt-Ir
CH4
0-47
0-87
CO
4-05
3-60
CO2
O-7O
0-60
N2
1-31—10-20 c.c
108 9-80 o.c
150 grms. of platinum black occluded 17 c.c. of gas—15*3 c.c. were absorbed by
potash lye, and the remainder was incombustible. D. Tommasi gave for the
absorption coefr. 1*75 for hydrogen, 9-35 for oxygen, 9-42 for sulphur dioxide,
and 65-00 for carbon monoxide. J. L». Smith found that air condenses on smooth
platinum as a film which can be removed by polishing. C. Zengelis observed
that when hydrogen is passed into a liquid in which platinum is immersed, the
metal adsorbs hydrogen.
The absorption of hydrogen by the platinum metals was noted by H. Becquerel,
K. Fischbeck, A. Frumkin and co-workers, G. F. Huttig, W. Frankenburger
and co-workers, W. G. Palmer, J. C. Stimson, T. WiIm, and F. Winteler.
A. Sieverts observed that the solubility of hydrogen in compact platinum is very
small. A. Mior said that platinum can take up 8-4 times its vol. of hydrogen, but
it takes a very much longer time to saturate the metal at ordinary temp, than it
does at a higher temp. A. Sieverts and E. Jurisch found that equilibrium is
attained very rapidly at a high temp. M. Bodenstein also reported an appreciable
solubility at room temp., but A. Sieverts and E. Jurisch thought that some
observations must have been misinterpreted, since they found that IOO grms. of
compact platinum absorbed at
409° 827° 1033° 1136° 1239° 1342°
Hydrogen
(0-006) o-ooo O-021 0-036 0-055 O-084 nigrrn.
These results compared with those for nickel are represented by the curves in
Fig. 17. T. Graham observed that at a red-heat platinum absorbs hydrogen and
retains it tenaciously at ordinary temp., but it gives
off the gas at a red-heat in vacuo. The metal does
not change its appearance when it absorbs the hydrogen,
but after driving off the gas, it appears to be
covered with bubbles. At a red-heat 1 vol. of plati­ i
num absorbs O-17 vol. of gas ; platinum black
absorbs 1-48 vols. Platinum foil which absorbed 0-70
vol. of hydrogen in 3 hrs. at 100°, absorbed 1-45 vols, ^
at 230°. One vol. of platinum wire made from molten
metal absorbs 0-128 to 0-207 vol. of hydrogen at a Ta
red-heat ; worked platinum (old crucible), 3-83 to
I
5-53 vols. ; worked platinum (old tube), 2-28 to 2-80
vols. ; and platinum black, 1*48 vols. Observations
were also made by M. Berthelot, A. Mior, W. Odling, 1
Plain urn I
" J
W. Skey, Z,. Anelli, F. H. Pollard, and A. Berliner. 800° 900" 1000° 1100° 1200° 1300°
The observations of M. C Boswell, and M. C. Boswell Fia. 17.—Tho Absorption of
and R. R. McLaughlin, were vitiated by the use of Hydrogen by Platinum.
a leaky apparatus. H. Damianovich and C Christen
studied the action of hydrogen at a low press., and under the influence of an electric
discharge. G. Kernot and F. de S. Niquesa studied the absorption of hydrogen by
colloidal platinum—vide supra ; and S. H. Barstow, by thin films of platinum.
drogen
sorbs m