248 Conductivity of Aqueous Solutions. Part VIII. 



from the first four determinations made in November, 1905, was used. 

 This will be seen to be substantially identical with that obtained in Feb- 

 ruary and March, 1906. In connection with the data on barium hydroxide 

 (obtained between March 28 and April 4, 1906) the slightly higher value 

 (1.2193) was used, which was derived from the four determinations 

 made during the work on this substance. In connection with the data 

 obtained after July 10, 1906, for which another bomb was used, the last 

 value of the conductance-capacity given in the table was used. 



The variation of the conductance-capacity with the temperature was 

 computed, as described in section 36, Part IV, from the dimensions of 

 the quartz cup used.* 



93. THE CONDUCTIVITY DATA. 



Tables 94 to 100 contain the conductivity data for all the solutions. The 

 measurements dated August and September, 1905, were made by Mr. 

 Y. Kato, while all the later ones are our own. 



The first column gives the date ; the second, the concentration at 4 

 in milli-equivalents per literf referred to the equivalent weight of oxygen 

 taken as 8.00 and the weights being reduced to vacuo ; the third, the tem- 

 perature of the measurement expressed on the hydrogen-gas scale ; the 

 fourth, the concentration at that temperature calculated as described in 

 section 91 ; the fifth, the measured conductance in reciprocal ohms, cor- 

 rections having been applied for the errors in the slide-wire, resistance- 

 coils, and leads, but not for the impurities in the water ; the sixth, the 

 equivalent (or molal) conductance calculated from the conductance given 

 in the fifth column, the concentration given in the fourth column, and the 

 value of the conductance-capacity appropriate at that date, as given in 

 section 92, the last being corrected to the temperature of the measurement. 



*This had an effective inside height of 1.45 cm. in Cell 11 and of 1.40 cm. in Cell 

 in and an inside diameter of 1.40 cm. in Cell 11 and of 1.37 cm. in Cell in. The 

 percentage corrections applied to the 18 value of the conductance-capacity were 

 the same for the two cells and at the different temperatures were as follows : 



50 75 100 128 156 218 260 306 

 0.06 0.11 0.16 0.21 0.27 0.41 0.52 0.63 



fExcept in the cases of phosphoric acid and potassium hydrogen sulphate, where 

 the concentration is expressed in milli-formula-weights per liter at 4. 



