282 E. L. Nichols — Chemical Behavior of Iron 



remained inactive, and the speed of the reaction was less. Ta- 

 ble V shows the character of these reactions and they are 

 exhibited graphically in carves " p" and "q" (figure 4). 



An attempt was made to eliminate the effect of cooling 

 during these reactions by studying the rate of cooling of the 

 solution and correcting the observed rise of temperature by 

 means of data thus obtained. The corrected values are thought 

 to indicate with considerable accuracy the relative amounts of 

 heat produced in the two reactions. They are as follows : 



\p (without mag.) ; total rise of temp. = 33° - 85 corr. 34 0, 46 

 ( q (with " ); .« " =l7°-85 " 24°-48 



Table V. — Solution of hydrochloric acid in presence of potassium chlorate. 



Magnet not acting. 



Magnet 



acting. 



Magnet acting. 



Times. 



Temp. 



Times. 



Temp. 



Times. 



Temp. 



Reaction "_p" 



Reaction "g ' 



Reaction "q" 



m 00 s 

 47 



40°-00 

 73-85* 



m 00 s 



30 



1 00 



1 30 



2 00 

 2 30 



37-90 



45-90 

 48-65 

 49-95 

 52-20 

 53-55 



3 m 00 s 



3 30 



4 00 



4 30 



5 00 

 5 30 



55°00 

 55-70 

 56-70 

 57-85 

 57-10 



* Owing to the great rapidity of the reaction, the only reading taken was at 

 the maximum. 



The reaction in which 3 grams of potassium chlorate were 

 used presented no peculiarities such as to necessitate their pre- 

 sentation in tabular form. They were in all respects corrobo- 

 rative of the results siven in table V. 



IV. — Experiments with Sulphuric Acid and Iron. 



The method was that already used with other acids. 



25 cc of the concentrated acid were mixed with 75 cc of water r 

 and the mixture when cool was made to dissolve 2 grams of 

 iron. The reaction was uniform and complete and apparently 

 of the same chemical character within and outside of the field. 

 The magnet was found, however, to increase the speed of reac- 

 tion and to decrease the amount of heat produced. The results 

 are given in table VI, and in curves " m" and "1," figure 3. 



