312 



Tables 304-306 

 TABLE 304. — Heats of Formation of Ions in Kilogram-Calories 



_|_ anc ] — signs indicate signs of ions and the number of these signs the valency. For the ioni- 

 sation of each gram-molecule of an element divide the numbers in the table by the valency, e. g., 

 9.03 gr. Al =9.03 gr. A1+ -|- 40.3 Kg. cal. When a solution is of such dilution that further dilu- 

 tion does not increase its conductivity, then the heats of formation of substances in such solutions 

 may be found as follows : FeCl 2 Aq == + 22.2 + 2 X 391 = 100.4 Kg. cal. CuS() 4 Aq =— 15.8 

 + 214.0 — 198.2 Kg. cal. 



TABLE 305. — Heats of Neutralization in Kilogram-Calories 



The heat generated by the neutralization of an acid by a base is equal, for each gram-molecule 

 of water formed, to 13.7 Kg. cal. plus the heat produced by the amount of un-ionized salt formed, 

 plus the sum of the heats produced in the completion of the ionizations of the acid and the base. 



TABLE 306. — Heats of Dilution of H 2 S0 4 



In Kilogram-calories by the dilution of one gram-molecule of sulphuric acid by m gram 

 molecules of water. 



Smithsonian Tables. 



