210 



Conductivity of Aqueous Solutions. Part VII. 



The specific-volume ratio for water at 302 is 1.417; at 306 1.4365. 

 The values for the ammonium hydroxide and acetic acid solutions there- 

 fore differ from that for water by 1.5 per cent and by 0.6 per cent 

 respectively. 



The two determinations of the volume of the bomb, made for the 

 above measurements, gave 127.9 c.cm. and 128.0 can. respectively for 

 the volume at zero, which corresponds to 129.5 c.cm. at 306. The values 

 of the thermal expansion-coefficient of the bomb, by means of which the 

 latter value was calculated, are reported in section 21, Part III. 



81. CONDUCTANCE-CAPACITY OF THE APPARATUS. 



The conductance-capacity was determined by measuring the conduct- 

 ance in the bomb of solutions of known strength, and dividing these 

 values into the known specific conductance of the solutions as deter- 

 mined by Kohlrausch.* These solutions were made to contain at 18 

 an exact number of equivalents in one liter. In table 73, the fifth 

 column gives the measured conductance of the solution; all the measure- 

 ments in 1905 having been made at 17.95, those in 1906, at 18.00. 

 The sixth column gives the conductance reduced to 18.00 and corrected 

 for the conductance of the water. The seventh and eighth give the 

 conductance-capacities at 18, and at 218 or 306 respectively. 



*Sitzungsber. konigl. preuss. Akad., 1900, 1002. The values used were: 



Potassium chloride, 0.01 normal, 122.43 



