dLo is the apparent enthalpy of the salts in solution 
Le is the partial enthalpy of salts in solution 
Lw is the partial enthalpy of water in solution 
x is the mass. fraction of salts an solution 
In an attempt to develop mathematical expressions for 
the apparent and partial enthalpies, we are confronted with 
the second question: Is sea water solution dilute enough to 
permit the use of Debye-Huckel theory? At very dilute con- 
centrations, enthalpies of electrolyte solutions may be 
calculated from Debye-Huckel theory, but deviations from 
this may become large as concentration increases. When 
mixtures of salts are involved, these deviations become 
Signiticant at even lower concentrations. “Once again our 
treatment is determined, not by what is precise and rigorous, 
but by expediency and limitations of knowledge. The Debye- 
Huckel theory has been slightly modified and extended by 
Bromley, as reported earlier (4). The pertinent equations, 
based on the extended Debye-Htickel theory are reproduced 
below: 
2 
2 \rn.M, y+ i/2 3 2 
Ny 
=m. u 
zZ Ff ot 
= ea (8) 
iMardl 2 
= : Ay oti /2 93/2 _ BN 2rm;M; =m a 
W v. 3 1000 1000 om 2 
mae Il 
a cn 2=m;M; im; : 
gael 1000 Lm; 2 (9) 
and, 
Z n 
r. : aH ym 525 a oe 2m. eT Dm; an 
2 rmiM; ied 2 2 
The doubly primed constants are related (for 1-1) salts to 
SZ 
