OXIDES AND NITRATES ON LEAD. 141 



Hydrated nitrate (tribasic) .... 2 (NO* 3 PbO) HO 2 HO 

 Hydro-ammoniacal nitrate (tribasic) . 2 (NO* 3 PbO) NH« 2 HO 



This compound is prepared by pouring caustic ammonia, 

 drop by drop, and not in a stream as in the previous case, 

 into a solution of nitrate of lead, of a specific gravity 1*080 

 at 60° Fahrenheit ; it presents all the characters of the 

 one previously examined. 



These are the results of analysis : — 



21-160ofsubstanceleft 17-409 of oxide, or 82-277 



21.036 „ lost 2-747 of nitric acid, or .... 13058 

 21-145 „ „ 0'972 of water and ammonia, or 



0-617 of water, or . . 2445 

 27-210 „ gave 3-459 of double chloride, or 0587 



of ammonia, or . . . 2-157 



100000 



HTDRO-AMMONIACAL SEXBASlC NITRATE OF LEAD. 



This new compound is the sexbasic nitrate of lead, in 

 which two of its equivalents of water, of the three which 

 enter into its composition, have been replaced by two of 

 ammonia. It was not prepared by pouring the ammonia 

 into nitrate of lead, but by pouring the latter into the 

 former; and it is also the only one described in this paper 

 which has no crystalline form, and which does not become 

 white again when heated sufficiently to drive off the 

 ammonia and water, but retains a salmon-coloured tint. 



Its analysis is as follows : — 



