iii the Magnetic Field. 



281 



Table IV. — Action of hydrochloric acid upon iron. 



Magnet not acting. 



Magnet acting. 



Times. 



Temperatures. 



Times. 



Temperatures. 



Reaction "/."* 



Reaction "A."* 



m 00 s 



30 



1 00 



1 30 



2 00 



40-00 

 50-29 

 51-39 

 50-42 



m 00 3 



30 



1 00 



1 30 



2 00 



40-00 

 52-24 

 52-36 

 51-98 



HC1 + KC10 3 



Each column gives the mean of ten experiments. 



The evidently greater amount of heat produced by the reac- 

 tion within the field, might be attributed, it was thought, to 

 the formation of a larger percentage of ferric chloride under 

 the influence of the mag- 

 net. Yolumetric determi- 

 nations of the amount of 

 ferric salt in the solution, 

 by the hyposulphite of soda 70 ° 

 method, showed, however, 

 that while the percentage 

 varied between 2 per cent 

 and 14 per cent, it was not 

 larger when the reaction 

 took place within the field 

 than under ordinary circum- 

 stances. The rise of tem- 

 perature was found, more- 

 over, to be independent of 

 the amount of ferric chloride 5 ° c 

 present in the solution and 

 its presence was thought to 

 be due to oxidation after 45 

 the completion of the re- 

 action. 



The reaction with hydro- 

 chloric acid was afterwards 

 repeated in the presence of 

 an excess of potassium chlo- 

 rate, by which means all the iron was converted into ferric chlo" 

 rate. The proportions used were25 cc HC1 + 25 CC H 2 + 1'5 grams 

 KC10 8 acting upon 1 gram Fe. The reaction was rapid and com- 

 plete, the solution was of a bright yellow color and free from all 

 traces of ferrous chloride. In this case the amount of heat pro- 

 duced in the magnetic field was much less than when the magnet 



65 c 



60 c 



55° 



40 c 



