Results 
BPE's over temperature range from about 80°C to 120°C 
at different concentrations are listed in Tables 17-23. 
The concentrations in the case of normal sea water (3.47% 
Table 18) and twice concentrated sea water (6.59%, Table 21) 
were determined by the Knudsen method. The observed BPE 
values were fitted to a second degree polynomial (Equation 20) 
by the method of least squares. The constants of the fits 
are shown in Table 16, along with the standard deviation o. 
The smoothed BPE values are shown along with observed values 
inwhable 24. 
No attempt has been made to fit the data obtained to a 
polynomial in salinity since further data at different 
concentrations are required. The observed boiling point 
elevation values have been plotted as functions of salinity 
with condensate boiling point (t_) as parameter, in 
Figure 18. Figure 19 shows BPE'sS as a function of temper- 
ature, salinity being the parameter. 
Osmotic coefficients (¢) and activities of water in 
the solutions were computed. Table 25 gives values of 
activities of water in the sea water solutions. Table 26 
and Figure 20 show values of osmotic coefficients. Activity 
coefficients of solute have not yet been evaluated in this 
study because of the limited data obtained so far. 
Table 27 gives the values of osmotic pressures of 
solution computed at 80 and 100°C. Partial molal volumes 
(V;) of water in NaCl solutions, taken from Stoughton and 
Lietzke (13) were assumed to hold for sea salt solutions 
also. The osmotic pressures were evaluated according to 
the formula 
M,RT¢ 
7 = ———— in, (19) 
V,, (1000) 
using, the; actual; salinities. reported in Tables 17 to 22. 
The salinities reported in Tables 16 and 24-27 are only 
nominal values. Actual values should be used for compu- 
tation of any derived quantity like activity. 
Sk 
