502 



aqueous solution. The salt is decomposed on boiling the solution, 

 half the ammonia being liberated, and oxide of copper precipitated : 

 this decomposition serves as a mode of determining the constitution 

 of the salt, which must be considered to be NH 4 ClO 4 +NH 4 CuO. 

 The total quantity of ammonia contained in the salt was likewise 

 directly determined ; the perchloric acid being, as before, weighed as 



potassium-salt. 



Found. 



(3) Ferrous Perchlorate, FeClO 4 +3H 3 O. 

 This salt is obtained by dissolving metallic iron in aqueous per- 

 chloric acid ; it is highly deliquescent, it does not lose water at 

 100 C., and when heated above that temperature it is decomposed. 

 The small greenish-white crystals obtained by concentrating the 

 solution were dried in vacua over sulphuric acid. Analysis gave : 



Found. 



181-5 100-00 



(4) Mercurous Perchlorate, Hg 2 ClO 4 +3H 2 O. 



Mercurous perchlorate is a highly deliquescent salt, obtained by 

 dissolving black oxide of mercury in dilute perchloric acid. It does 

 not lose water either at 100 C., or in vacuo over sulphuric acid. 



Found. 



