[ 228 ] 



SeSiion \oth. 



Vitriol of Lead. 



By the experiments of Klaproth, loo grains vitriol of lead 

 fliould contain about 71 of metallic lead ;* by thofe of Bergman 

 and Wenzel nearly 70 ; but as the lead, being precipitated from 

 the nitrous acid, is in a calcined Hate, we may add 4 of oxygen. 



Again, Wolfe found 120 grains vitriol of lead decompofedby 

 tartarin to afford 65 of vitriolated tartarin; therefore 100 grains 

 of this vitriol would afford 54,16 of vitriolated tartarin. Now 

 this quantity of vitriolated tartarin contains 23,37 °^ ^^^ ^^' 

 triolic acid ; therefore juft fo much is contained in^ioo grains of 

 vitriol of lead. Phil. Tranf. 1779. and 10 Roz. 368. 



Hence the quantity of ingredients in 100 parts of this /ah 

 are 75 calx of lead, (=71 of metallic lead) 23,37 ^^^^ vitriolic 

 acid, and 1,63 water. 



Hence 100 grains metallic lead{yvixh. the addition of oxygen) take 

 up 32,91 of real vitriolic acid, and afford 140 of vitriolated lead. 



And ICO parts real vitriolic acid, unite to 303,8 of metallic lead, 

 (when calcined; and afford 425,49 of vitriol of lead. 



According 



* See I Klapr. p. 169, and 173; and 2 Ellapr. p. 219. 



