OF LEAD. 367 



carbonate, is anhydrous two, the phosphate 

 and arseniate, contain 1 atom of water four, 

 acetate, tartrate, citrate and muriate, contain 2 

 atoms one, oxalate, contains 3 and two, sul- 

 phate and nitrate, contain 4 atoms. 



16. SALTS OF LEAD. 



1. Sulphate of lead. This salt occurs native Sulphate, 

 in regular crystals, though from its insolubility 

 it cannot be crystallized artificially. The pri- 

 mary form of the crystals is a right rhombic 

 prism. It is anhydrous, though it usually con 

 tains a trace of water mechanically lodged be- 

 tween the plates of the crystals. Its constituents 

 are 



1 atom sulphuric acid 5 



1 atom protoxide of lead 1 4 



19 



2. Nitrate of lead. This salt is easily soluble Nitrate, 

 in water, and may be obtained without difficulty 

 in large white opaque crystals having a vitreous 

 lustre, and the shape of regular octahedrons 

 with a square basis ; it is likewise anhydrous. 

 Its constituents are 



1 atom nitric acid . 6-75 

 1 atom protoxide of lead 1 4 



