ri % | | 
salt-dose!) metal-dose total radio- |  metal-dose a> tot. rad 
in mgr. in mgr. activity per gramm — — =O eee 
per litre per litre per secunde atomweightmet. _ inmgr.p. Sec. 
_ litre-dose 
mol. weight 
Metals used 
—_— 
| 
Potassium | | Ee 
Pat chloride) 1.34 100 53 0.3X 10-1 erg. 1.5 | 0.000045 
Rubidium | 
(as Rubidiumchlo- | 1.20 150 =| 105 07. A0 EREN val 1 ‚_0.000084 
ride) | 
— — — Le l — —- — ~~ — a on = = — == 
Uranium | ie 
(mostly as uranyl- | 0.063 25 15 | 0.8 erg. 0.06 0.000048 
nitrate) 
i om Ue Te Seen ee ae . a 
pene | 0.10 50 24 0.3 er 0.1 0.000020 
(as Thoriumnitrate) | : aye 8: i toe é 
Radium | | 
(as Radiumsalts) IN | a >< 10e 3106 1.38 & 106 erg. LOS …_0.000019 
| | 
occurs in the animal circulating-fluids and in the tissue-fluids, and 
that, carried along by ions, may adhere to the cells. 
Utrecht, 28 September 1916. 
Chemistry. — “On the Influence of Temperature on Chemical 
Equilibria’. By Dr. F. E. C. Scurrrer. (Communicated by 
Prof. J. D. vaN DER WAALS). 
(Communicated in the meeting of Sept. 30, 1916). 
1. The expression for the influence of temperature on equilibria. 
When in a rarefied gas mixture or a diluted solution a chemical 
reaction is possible, there exists a definite relation between the 
concentrations of the reacting substances in the state of equilibrium. 
The ‘constant of equilibrium”, the value of the product of the 
concentrations of the substances of one member of the reaction 
equation, divided by that of the concentrations of the substances of 
the other member, in which every concentration is raised to the 
power of which the exponent gives the number of molecules taking 
part in the conversion, is constant at a definite temperature, but 
1) The salt doses in RiNGer’s mixture give some scope for variation, also when 
the Calcium-content is permanent; the values given are those actually used by us. 
