32 



JOTJENAL OF THE MiTCHELL SoCIETY 



[July 



rise of temperature as ordinate. This point is found to be 

 39.7 cc, tlie same reading as was found by the extraction 

 method. 



The "temperature method" was further confirmed by its use 

 with solutions of sulphuric acid and ammonia, both about twice 

 normal. The rise of temperature, taken with the same thermo- 



36.0 



38.0 40.0 42.0 



Total ec. ammoaia added. 

 Fig. 2. 



44.0 



meter, as before, was constant until the neutral point was 

 reached. The results obtained are given in Table III and the 

 neutral point agrees exactly with that found by the direct 

 titration of the ammonia against the acid. 



TABLE III 



Cc. Ammonia added to 40 cc. acid. 



Temperature. 



38.5 27.62° 



39.0 27.70 



39-5 27.79 



40.0 27.88 

 40. 5 27.96 



40.1 28.05 

 41-5 28.05 

 42.0 28.01 

 42.5 27.98 

 43-0 27.95 



