Section 95. Final Values of Equivalent Conductance. 



263 



The values given in table 109 for sulphuric acid are the means of those 

 obtained by Mr. Kato and ourselves in the case of the 2 and 12.5 milli- 

 normal solutions. The values derived bv each were as follows: 



We regard our values for the very dilute 0.5 milli-normal solution as 

 more reliable because of the fact that our bomb was rotated, thus remov- 

 ing any contamination from the immediate neighborhood of the electrodes. 



Table 110 contains a comparative summary of the results at 18 of 

 previous investigations and of our own. From all the earlier values the 

 conductance of the water has been subtracted, while in the case of our 

 values, this has not been done; but the conductance of the water used 

 (0.3 to 0.5 X 10" 6 at 18) amounted to only about 0.2 per cent of that 

 of the 0.5 milli-normal acid solutions. Interpolated values are inclosed 

 within parentheses. 



Table 110. Comparison of the conductance values at 18 with those of other 



investigators. 



*Kohlrausch & Holborn, Leitvermogen der Elektrolyte, p. 160. 



tinterpolated from a plot of the values given by Whetham in Z. phys. Chem., 55, 205 (1906). 

 These values are dependent on Kohlrausch's at 0.02-0.03 normal. 

 JPhys. Rev. 8, 269 (1899). Interpolated from a plot. 

 Proc. Am. Acad., 40, 413 (1904); Phys. Rev., 19, 386 (1904). 



Our values for sulphuric acid agree fairly well with those of Kohl- 

 rausch and of Whetham, except for the concentration 100 milli-normal, 

 where our value is 3.6 per cent greater than that of Kohlrausch. On 

 account of this discrepancy, a check measurement was made (on May 14, 

 1906) at this concentration in a U-shaped glass vessel; and the value 

 233.6 was obtained for the equivalent conductance, which differs by less 

 than 0.2 per cent from the determination made in the bomb. The values 

 for the stronger solutions of phosphoric acid agree very well with Fos- 

 ter's ; but our values for the dilute solutions are considerably greater than 



