192 



Conductivity of Aqueous Solutions. Part IX. 



103. CONDUCTIVITY AND HYDROLYSIS OF THE AMMONIUM SALT OF 



DIKETOTETRAHYDROTHIAZOLE. 



The data relating to the conductivity of the pure ammonium salt are 

 presented in table 122, which is arranged like tables 120 and 121 except 

 that the specific conductance is given in addition to the equivalent con- 

 ductance. 



Table 122. Conductance of the ammonium salt of 

 dike tote trahydrothiazole. 



It will be seen that the values of the equivalent conductance at about 

 the same concentration, which were determined with solutions made up 

 separately from the solid acid and the stock ammonium hydroxide solu- 

 tion, agree in every case within about 0.1 per cent. 



For the purpose of facilitating the subsequent calculation of the hydrol- 

 ysis, the specific conductance l has been expressed as a concentra- 

 tion-function of the form C = aL -r-/?J_J which corresponds to the van't 

 Hoff function (CA) ? = KC(A A), which is known to express approx- 

 imately the variation of the equivalent conductance A with the concentra- 

 tion C in the case of neutral salts. As this equation is to be used only 

 for interpolation for a small distance from the values from which it is 

 derived, any possible inaccuracy in the assumed form of the function could 

 not introduce a significant error. Using the conductance values at 0.02 

 and 0.05 normal as the basis, the corresponding numerical equations are : 



C = 17.330 L+ 43.34 lS at 

 C = 10.832 l + 22.95 L? at 18 

 C= 9.373 L-f- 18.45 L at 25 



