CHEMISTRY: HENDERSON AND COHN 
619 
odltntty 
TeTfiPerdtti re 
Hydrogen ion 
CO2 tension 
per cent 
degrees 
concentration 
mm. 
31.92 
20=t 1 
135 
X 
10-^ 
760 
31.92 
20=fc 1 
Izl 
X 
10 ^ 
700 
31.92 
20± 1 
112 
X 
10-^ 
600 
31.92 
20=t 1 
93 
X 
10-'^ 
500 
31.92 
20=t 1 
7o 
X 
10 ^ 
400 
31.92 
20± 1 
X 
1 f\ 7 
lU ' 
300 
31.92 
20=t 1 
60.1 
X 
1 n— 7 
10 ' 
200 
31.92 
20=1= 1 
1/ .U 
X 
< A 7 
10 ' 
100 
31.92 
20± 1 
Iz . 1 
X 
10 ' 
75 
31.92 
20=1= 1 
8. / 
X 
10 ' 
50 
32.45 
20=t= 1 
C O/f 
0 .z4 
X 
1 A 7 
10 ' 
25 
32.45 
20^ 1 
z . 19 
X 
< A 7 
10 ' 
10 
32.45 
20=t 1 
1.74 
X 
10-7 
7.5 
32.45 
20± 1 
1.20 
X 
10-7 
5.0 
32.45 
20=t 1 
0.66 
X 
10-7 
2.5 
32.45 
20=t 1 
0.27 
X 
10-7 
1.0 
32.45 
20=t 1 
0.195 
X 
10-7 
0.75 
32.45 
20± 1 
0.121 
X 
10-7 
0.5 
32.45 
20=1= 1 
0.078 
X 
10-7 
0.25 
32.45 
20± 1 
0.057 
X 
10-7 
0.1 
2. Efect of Salinity upon the Hydrogen Ion Concentration of Sea Waters 
at the same Carbon Dioxide Tension. — Such variations of salinity as oc- 
cur in the sea, although they do not ordinarily sensibly affect the pro- 
portions of the several components, must obviously exert a certain in- 
fluence upon the hydrogen ion concentration. The following data indi- 
cate approximately the magnitude of this effect. 
CO2 tension 
Hydrogen ion 
Number 
Depth 
Salinity 
mm. 
concentration 
10313 
20 meters 
30.73 
0.3 
0.093 X 10-7 
10301 
31.58 
0.3 
0.087 X 10-7 
10305 
32.05 
0.3 
0.085 X 10-7 
10305 
32.34 
0.3 
0.085 X 10-7 
1000 
20 ft. 
32.45 
0.3 
0.087 X 10-7 
10299 
210 meters 
33.62 
0.3 
0.081 X 10-7 
10304 
34.16 
0.3 
0.083 X 10-7 
10288 
225 meters 
34.60 
0.3 
0.079 X 10-7 
3. Efect of Temperature upon the Hydrogen Ion Concentration of Sea 
Water. — more important effect upon hydrogen ion concentration is 
exerted by the temperature. This depends, first, upon the change in 
the absorption coefficient of the gas with change of temperature and, 
secondly, upon a simultaneous change in the ionization constants of the 
several substances involved in the equilibrium. Certain observations 
upon the apparent hydrogen ion concentrations of sea water at different 
temperatures, to which no value as quantitative estimations can at 
