640 
and 1565° K. If now for 7, 1400° is chosen, we shall make an 
error of: 
0.003 (c,—e,) 0.006 (e‚ — ¢,) 
—_—__—_———— resp, — —-- 
R hk 
on omission of the correction term of 8 at the highest and the 
lowest temperature. 
If we now consider that c, is about 6 R, c, 7!/, B, and c,—e, 
amounts therefore to —3 R, the errors in /n K become 0.005 resp. 
0.009, in K 0.5°/, resp. 0.9°/,. At the intermediate temperatures 
the errors are smaller. As now errors of several percentages are 
not rare, the deviation keeps far within the errors of observation 
when the correction term in question is neglected. 
On an earlier oceasion I calculated the expressions of the carbonic 
acid equilibrium by the aid of the best known data for the specific 
heats for another purpose *). The equations used had the following 
form : 
29530 ‘ 
log Ky, = —— + 2.92 log T—0.0014197 41.61 10-172 41.75 , (9a) 
29600 kli E : 
a + 2.93 log T— 0.001286 71.61 10-77?-+ 1.57 . (9) 
29570 ie ot) z RAS 
1259 log T—0.0018627'+1.74 10112 42.71 . (9e) 
29600 de | 
=p $1.75 log 10000667473. « … … … … (9d) 
29500 ee 
Ter + 2.5logT —3log\1—e F JH 
En Nn, 
+ 2 Hag —e an zoos et ee ) +225 . (9e) 
5630 5630 
29490 5 ae 
En +2.5 log rtl 1 Ne 27 ) + 
1800 1800 2920 ne 2920 
+ een is Ees 7) ugl 1e T ee 27 Na 2.22 (9f) 
The simple equation 2 yields, when the constant is taken in 
partial pressures : 
log kK, = — —— ob log jk + 5.99 . . . . 0 (99) 
In the table on the next page I have combined the observed 
equilibrium values and the deviations yielded by the expressions 9a—g. 
ĳ These Proc. XIV, p. 747 et seg. 
