Sections 14-15. Water Correction and Conductivity Data. 39 



14. THE WATER CORRECTION. 



The conductance of the water at the various temperatures of the experi- 

 ments was subtracted from the measured conductance of the solution. 

 Two experiments, the data of which are given in table 4, served as a basis 

 for the correction. For a fuller discussion of this correction see section 10. 



The last two lines give the percentage corrections to be applied at the 

 various temperatures to the observed conductances in the case of a 0.002 

 normal sodium chloride solution. They are given so as to show the order 

 of magnitude of these corrections. The correction decreases of course in 

 the same proportion as the specific conductance of the solution increases. 



Table 4. Observed conductance (X10 G ) of water in the bomb. 



15. THE CONDUCTIVITY DATA. 



Table 5 (pp. 40, 41) contains the conductivity data for the various solu- 

 tions. The first four columns require no explanation further than the state- 

 ment that the concentration is expressed in milli-equivalents per liter as has 

 been done throughout this series of articles unless otherwise noted. The 

 fifth column gives the concentration at the temperature of the measure- 

 ment, corrected in the case of the 140 and 218 values for the solvent in 

 the vapor space. The correction is made as explained in section 10, and 

 amounts to -f 0.05 per cent at 140 and + 0.18 per cent at 218. The sixth 

 column contains the observed resistances of the bomb, expressed in ohms, 

 after correcting for errors in the resistance coils and slide wire, and 

 deducting the resistance of the lead-wires. The seventh column gives the 

 equivalent conductance obtained by dividing the conductance-capacity for 

 the given temperature by the concentration at t (given in the fifth col- 

 umn) and by the resistance (given in the sixth column) after correcting 

 it for the water, and by multiplying the result by 10 6 . 



