Section 34. Errors and Corrections. 75 



By calculation* from these data, the specific volume of water-vapor 

 at 281 was found to be 29. That at 306 was found to be 18 by plotting 

 the previously known values up to 200, this value at 281, and that at 

 the critical temperature. In all the experiments of this investigation the 

 volume of the vapor-space at 30G was determined by measuring the ratio 

 of the conductances at the upper and lower electrodes at 306, and that 

 at 281 was calculated from this with the help of the ratio of the 

 specific volumes at 281 and 306 and the volume of the bomb at those 

 temperatures. 



From the specific volumes of vapor and solution and the actual volumes 

 of the vapor-space and of the solution the corrected concentration (C ) 

 was calculated from that (C) which would have prevailed if there had 

 been no vaporization.f The correction was on an average +0.43 per cent 

 at 281 and +0.13 per cent at 306. 



CONDUCTANCE OF THE WATER. 



The conductance of the water was experimentally determined by mak- 

 ing measurements with conductivity water at the different temperatures 

 by exactly the same procedure as was followed with solutions. It was 

 subtracted from the conductance of the solution in every case. The neces- 

 sary data will be found in section 35. 



CONDUCTANCE-CAPACITY IN RELATION TO THE VOLUME OF SOLUTION 



IN THE BOMB. 



The following experiment was made in order to determine whether the 

 conductance-capacity of the bomb was at all affected by such variations 

 in the volume of the solution contained in it as actually occurred in this 

 investigation. Different quantities of 0.01 normal potassium chloride 

 solution were put into the bomb and measurements made at both 18 and 

 approximately 100. 



Li + L2 / Vi Zh_\ . 



*This was done by means of the equation v 2 - \~l " _ I in which v is the 



J Li L2 ^ Wl Wz ^ 



specific volume of the vapor, Vi and v* represent the vapor-spaces, W\ and ZV2 the 

 weights of solution, and Li and L 2 the conductances in the two experiments. 



{This was done by means of the equation Cn C( l-\- Tr X ' V J in which V and 



V Vy Vl / 



V "f" v 

 v are the specific volumes of the liquid and vapor respectively, Vi and v% are the 

 actual volumes of the liquid and vapor respectively. 



