434 MR. G. B. BIJCKTON ON TKE ISOLATION OF THE OEGANO-^LETALS. 
glasses, and ignites at a comparatively low temperature, with the characteristic lead 
"'Then heated with concentrated sulphuric add. the salt blackens, and is convert^ 
into sulphate of lead. After addition of a little nitric acid this 
removed, and the sulphate may be used for a quanritatave determmarion of the lead. 
Sulphate of Bi^UmUc Trietliyl 
Mav be formed by adding dilute sulphuric acid to a warm concentrated solution of 
the chloride. On account of its greater insolubility, it crystallizes out on coolmg, i 
the of fine asbestos-like needles. These may be puiified by solution in alcohol, 
in which the sulphate is more soluble than in water. From alcohol the crystals mat 
be obtained of considerable size. 
0-6055 grm. of substance gave 0-3850 grm. carbonic acid and 0 20oo gi-m. watei, lead 
inn to the formula ^ tt T>n fn \ ‘sO 
^ Pb, SO« or Pba {C, 
which requires the following values 
2 equivs. of Lead . 
12 equivs. of Carbon . 
16 equivs. of Hydrogen . 
1 equiv. of Sulphur . 
4 equivs. of Oxygen . 
Theory. 
ys 
Erperiment. 
207 
72- 
15 
16 
32 
60-52 
21-05 
4-38 
4-64 
9-41 
100-00 
20-77 
4-47 
It would appear, therefore, that from two molecules of the organo-metal, one equi- 
valent of ethyl only is displaced by the negative chlorine, or the compound group SO 
H h r my attempts to produce a lead base richer in ethyl have failed. lAperiment 
fhows that if chloL be passed over the sesqiiiethylated chlonde, the decomposition 
proceeds beyond the removal of the additional equivalent of ethyl; m fact tlm ^ 
enters into combustion and is entirely destroyed. The aqueous solution of the c loiide 
appears also to be unaffected by a stream of chlorine gas. Chloride of lead is not now 
down. 
Oxide of Bi^lumbic Tnethyl. 
The alkalies do not immediately form precipitates in the aqueous solutions of the salts 
of this base; but when the solid chloride is gently heated with strong potash, ^ oil; 
body sinks without liberation of oxide of lead. The same body may be obtamed moie 
conLiently through the agency of oxide of silver. The oil which forms on coolmg a 
crystalline mass, is oxide of diplumbic triethyl. It readily volatilizes in white pimgem 
fumes, which provoke sneezing. It strongly blues litmus paper, and attracts caibonic 
