140 



PK0FES80R CALVERT ON THE 



100000 

 HYDRATED AMMONIACAL TRIBA8IC NITRATE OP LEAD. 



I prepared this salt by pouring an excess of ammonia 

 rapidly into a solution of nitrate of lead, of a specific gra- 

 vity of 1*080 at 60" Fahrenheit, and leaving the whole in 

 contact during several hours, by which time it had under- 

 gone the same molecular change as took place in the pre- 

 vious salt, which, with the exception of being in smaller 

 crystals, it perfectly resembled. 



These are the numbers obtained by its analysis : — 



24 617 of substance left 19-833 of oxide, or 80-566 



14-971 „ lost 1-945 of nitric acid, or .... 12991 



15033 „ „ 0-957 of water and ammonia, or 



0-350 of water, or . . . 2328 

 24-077 „ gave 5-742 of double chloride, or 0973 



4-041 



99-926 



Equivalents. 



6PbO = 



2 NO* = 



2NH» = 



3H0 = 



100-000 

 The two salts which I am going to examine, are not 

 nitrates of lead in which the oxide is replaced by ammo- 

 nia, but the tribasic and sexbasic nitrates of lead, in which a 

 given quantity of their water of crystallisation is replaced 

 by an equivalent amount of ammonia. 



HTDRO-AMMONIACAL TRIBASIC NITRATE OF LEAD. 



This salt is the tribasic nitrate of lead, in which one 

 equivalent of ammonia replaces one of the equivalents of 

 water out of the three which it contains ; for example — 



