I/O 



Conductivity of Aqueous Solutions. Part VI. 



*In taking the means, the values marked with an asterisk have been omitted on account of 

 their large deviation. 



fMean of experiments carried to 218. 



JMean of the two concordant determinations made in the U-shaped cell. 



J Mean of experiments carried to 156. 



It will be seen from table 54 that the results of the separate experiments 

 with sodium hydroxide agree closely with one another, very few of the ini- 

 tial values deviating from their mean by as much as 0.2 per cent. A 

 comparison of the initial and final values at 18 shows that heating to 156 

 produced a decrease of conductance of less than 0.3 per cent in the three 

 stronger solutions and one of 0.6 per cent in the 2 milli-normal solu- 

 tion, but that heating to 218 decreased it by 0.8 per cent in the 49 and 

 J 9 milli-normal and by 2.4 per cent in the 0.4 milli-normal. The latter 

 decrease is so large that in deriving the best value at 218 we shall 

 increase the mean value by half this amount or 1.2 per cent, it being prob- 

 able that the observed decrease in conductance at 18 had taken place in 

 some measure at 218. At 18 with the 49 and 19 milli-normal solutions 

 the mean results obtained in the U-shaped cell will be adopted as the best 



