1892.] Formation and Decomposition of Nitrous Acid. 



31 



These results show that whereas the amount of nitrogen peroxide 

 present in the most concentrated acid is doubled by heating under the 

 conditions described above, yet the amounts of this same impurity 

 produced in the less concentrated acids are quite inappreciable. A 

 series of other determinations were made at high temperatures, the 

 results of which are given below. 



