1020 
TromseN and BERTHELOT in good agreement at 44000 cal. The specific 
heats of H, and HCI differ little from 5 at room temperatnre; the 
energy of vibration is, therefore, still imperceptible here. Hence the 
corresponding terms with rp can be omitted in 16. The specific heat 
of chlorine amounts to 8.130—1.985 —= 6.145 at 7==616.4 according 
to STRECKER (for constant volume)'). This value corresponds to 
2=9.5u (see eqnation 12). If this is substituted in equation 16, 
the term with », appears to have no appreciable value at room 
temperature either; we may, therefore, take nH and Yn Lp 
equal, and for the hydrochloric acid equation 15 may be transformed 
into: 
SEN 
: 44000 & —e “| MM, 
log K= — 18717 + log ———— 5 oa — + log - Meee (17) 
& aN, | 
or 
adonke” 
MM, es 4) 9626 
log —— + log —- - = log K + a + 1,458 (18) 
M, % x Yoh ee vgh 
Leg ELAN a EE 
The experimental determinations which admit of a test of 18, 
are the determinations of the gas cells of DorrzaLeK®) and Mürrur®) 
and the direct determination of the dissociation of LOWENSTEIN *). 
If the values found by them are filled in in 18, we find: 
E ABLE Vi 
" T | ER Second mem- / MM; 
ber of 18 | 08 ye Observer 
| | | 
25 298 — 33.18 0.58 | 0.58 MiiLLER 
30 °-| 303.) 3/32, 80y le OLED a RIEN DOLEZALEK 
1556 | 1829 | — 5.772 0.95 0.70 | LOWENSTEIN 
| | 
mean 0.71 
1) Srrecker Wied. Ann. 17. 102 (1882). Cf. also Pier. Zeitschr. f. physik. chem. 
62 416 (1908). 
2) DorezareK. Zeitschr. f. physik. Chem. 26 321 (1898). Bopensrein and Geieen. 
ibid. 49 72 (1904). 
3) Mürren. Zeitschr. f. physik. Chem. 40 158 (1902). Nernst. Sitz. Ber. Preuss. 
Akad. 1909. 263. 
4) Lowenstein. Zeitschr. f. physik. Chem. 54. 715 (1906). The value given in 
the table VI has been corrected for the dissociation of chlorine into atoms. See 
Nernst. Zeitschr, f. Elektroch. 15 689 (1909). 
