ORGANIC ACIDS. 



The acids used were all obtained from Kahlbaum. Each acid was purified by the 

 method best adapted to that particular acid, and its purity tested. 



The method of work was, in general, the same as that followed with the inorganic 

 salts. The cell constants were determined as in the work with salts. The follow- 

 ing table of data will show how well the constants as calculated from three different 

 readings with three different resistances agreed with one another, the table being 

 taken from the work of Wightman; W being the resistance in the rheostat, b the dis- 

 tance on the wire from the point of contact to one end of the wire, and A' the cell 



constants. 



Cell Constants. 



The first eight cells were used with the various dilutions of the acid. Cell A is the 

 cell with cylindrical electrodes with very small constant, and was employed to deter- 

 mine the conductivity of the water. 



Cells V, IV, II, and I were used to determine the molecular conductivity of a 0.002 

 normal and a 0.0005 normal solution of potassium chloride at 25, these solutions 

 being used to standardize the cells with small constants. The data show how con- 

 cordant were the results obtained. 



DISSOCIATION OF ORGANIC ACIDS. 



The dissociation of most of the organic acids cannot be determined directly by 

 simply increasing the dilution of the solution until complete dissociation is reached. 

 The dilution at which /x^ would be reached for these weakly dissociated compounds 

 would be so great that the conductivity method could not be applied to them. It is 

 well known that we have an indirect method of determining the dissociation of 



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