Lead Arsenate 49 



one molecule PbHAs04, whereas it can from two mole- 

 cules. In other words the student is askt to ecboIv 

 2PbHAs04 into 2PbO, AS2O5 and HoO, the water being 

 neglected in this case. 



10. What are the advantages of lead arsenate over 

 Paris green? 



