1501 
TABLE 6. 
3 T Fanart Extrapolation to the 
Tempera- | “EMPE- Heat transition point 
N°. ‘tureboiling Fäture perGramme column 
jacket Calori- °__NH,CI EE an (foe 
meter 2 3 4 
1.28 158.3 13.85 © 1631 | 
184.5 16.55 — 3.15 
7, 8, 9, 10 179.05 16.0 — 6.36.) 
4, 5, 6 158.6 16.15 —15.96 j 
184.5 15.95 — 3.80 
7, 8,9, 10) 179.05 16.0 — 6.36 | 
Ti w2; 13 195.4 15.85 +19.17 | 
» 184.5 15.6 +15.45 
14, 15, 16 | 211.6 16.2 | +24.70 | 
1—10 ; 184.5 15.6 — 3.83 
of temperature, multiplied by the difference in specific heat of the 
solution and of pure water. This is clear as follows: Let us call 
the temperature at which the tube is heated 7, the temperature 
of the calorimeter after the experiment 7’. and 7. then the libera- 
ted heat in the two cases (after correction of the heat of the glass) is: 
7, 7 
frr Q. resp. frr, in which Q denotes the heat of solution. 
Te Te’ 
Te’ 
The difference, therefore, amounts to foar 02 Oe 
Te 
Bearing in mind that: 
Qe — Qe = (Le — Te) (¥ + ¥H,0 — Yopl.) + 
it is clear that in this correction the specific heat of the ammonium 
chloride disappears, and the difference in specific heat between the 
solution which contains 1 Gramme of NH,Cl, and the water of this 
solution remains. This difference could not be determined except as 
the difference between two much larger values; it appears, however, 
from table 6 that this difference bas hardly any influence on the 
transition heat. In the experiments 1, 2, and 3 the calorimeter 
temperature is on an average 13.85°, in 4,5, and 6 however 16.15°: 
in the transition heat this difference yields only a value of 0.05 
gramme calorie per gramme of ammonium chloride as appears from 
the last column of table 6, If therefore; the calorimeter had been 
