Effect of Temperature, Acidity, etc. 



415 



The loss of sulphuric acid from the inside to the outside 

 tube by distillation was found to be fairly constant, other con- 

 ditions remaining unchanged. Fig. 3 shows that the relation 



Fig. 3. 



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Final concentration of H 2 SO4 



Fig. 3. Showing the relation of the initial to the final acid concentration. 



between the initial and the final acid concentration is approx- 

 imately linear. Since it appears from what follows that the 

 final acid concentration is the factor which determines the 



