OXIDES AND NITRATES OF LEAD. 18^ 



vessel with boiled water, and removing every trace of solu- 

 ble bodies, they were dried in vacuo over sulphuric acid. 

 This ammoniacal nitrate of lead, heated at a low tempera- 

 ture, decrepitates, becomes yellow, and loses water and 

 ammonia. If at this period the salt is left to cool, it be- 

 comes again white ; but if the heat is much increased it 

 acquires a bright red colour, and gives oiF nitric acid. The 

 crystalUne massicot left is of a fine yellow, and is com- 

 posed as follows : — 



Per cent 



45-686 of substance left 38'307 of oxide, or ...... 83-861 



22-456 „ lost 2?15 of nitric acjd, or .... 10309 



22-566 „ lost 1-250 of water and ammonia, or 



0-524 of water, or . . 2322 

 18-706 „ gave 3-550 of double chloride, or 0602 



of ammonia, or . . . 3-218 



100-000 



As these numbers shew, this salt is the previous one, in 



which one equivalent of ammonia has substituted itself for 



one equivalent of oxide of lead. 



Hydrated ammoniacal quintibasic nitrate of lead 2 (NO*^ 5 PbO, NH') 3 HO 

 „ „ quadribasic „ 2 (N0« 4 PbO, NH») 3 HO 



ANHYDBOUS QUADRIBASIC NITEATE OF LEAD. 



This compound is derived from the previous salt, and 

 has all the character of a sub-nitrate of lead, therefore it is 

 not necessary to enter into any details. Its analysis is as 

 follows: — 



29-326 of substance lost 3*120 of nitric acid, or 10632 



Oxide left 89368 



100-000 



