The Hydrogen-ion Concentration, etc., of Sea-Water. 



63; 



some of the Na2C03 used in standardizing the HCl, and weighed with- 

 standardized weights. The total CO2 as calculated and found in thiS' 

 solution differed by about 0.5 per cent. 



Dole used a simpler (titration) method for determining the CO2 in 

 sea-water, but we have not yet had time to compare it with our 



17 



Grams of chiorinc per liter 

 18 19 20 



22 at 2lf 



at 30" 



18 19 20 



Grams CI per kilogram of solution 



22 



Fig 



22. — Conversion table for finding the absorption coefficient of acidified sea-water for 

 CO2. This table was taken from the center of a graph plotted from Bohr's data on the 

 absorption coefficients of distilled water and solutions of NaCl for CO2 on the assumption 

 that the absorption coefficient of sea-water and salt solution of the same CI content are the 

 same, provided the sea-water does not contain alkali to combine with the CO2. The error 

 that may be the result of this assumption is necessarily minute and insignificant compared 

 with errors that might arise from slightly incorrect thermometers. Each diagonal is for 

 a different temperature. The grams of CI per kilogram of sea-water are indicated below and 

 grams of CI per liter of sea-water at 20° and again at 30° is indicated above. 



