248 On the Oxidation of Ferrous Salts 



TABLE IV. 



It will be seen that during this series of observations the 

 temperature rose from 13-5 C. to 15-2 C., in consequence the 

 decomposition has gone on during the short intervals more 

 slowly, and during the long intervals more quickly than it 

 would have done at a mean constant temperature. 



In Table V are given the results of observations on the 

 action of nitrate and perchlorate solutions at higher tem- 

 peratures. The composition of the solutions was as before, 

 10 c.c. ferrous sulphate (c), 20 c.c. H 2 SO 4 , 30 c.c. water, and 

 10 c.c. of perchlorate or nitrate of potassium. They were heated 

 for five or six minutes to two intermediate temperatures, and 

 also boiled for a like time. In three blank experiments made 

 during the series 17-55, 17-50, and 17-55 c.c. permanganate 

 were used. 



TABLE V. 



From these results it will be seen, and in the case of nitrate 

 at least with surprise, that even boiling for five minutes has 

 had no effect in bringing about a reaction between the oxidising 

 agent and the ferrous salt. In the case of chlorate it is other- 

 wise. In the following three experiments the chlorate was 

 allowed to act for five minutes. In a blank experiment 17-6 c.c. 

 permanganate were used. 



