A Manual of the Chemistry of the Carbon Compounds

THE CARBON COMPOUNDS. 115
Potassium EthyhubMte. Ethylsnlplionic Add.
K-0-S-O-O—CJHJ CjH6--O—S—0-O—H
Ethyl Phosphates.—Orthophosphoric acid forms three ethyl compounds
:—
Triethyl Phosphate C & W Die%lphosphoric %j
CJEL)
Ethylphosphoric Acid H >PO*
Hj
Triethyl Phosphate is obtained by heating silver phosphate with
ethyl iodide, or by acting with phosphorus oxychloride upon sodium
ethylate. It is a colourless liquid, boiling at 215°, and having a peculiar
smell It is soluble in water, by which it is slowly decomposed.
Diethylphosphoric Acid is a monobasic acid, which is only known
in solution. It is formed by bringing alcohol vapour gradually in
contact with phosphorus pentoxide:—
O + P2O6 = O2rl! j P04 + HPO
Lead diethylphosphate is soluble in water and crystallizes in
needles. When heated it melts, and at a higher temperature it is
decomposed into triethyl phosphate and lead ethylphosphate :—
C2H6
6)
b B
Pb
CA PO,
c2ti8)
Ethylplwsplwric Add is also formed by heating alcohol with syrupy
phosphoric acid. It is a colourless, syrupy liquid, of a very sour
taste. The lead salt is almost insoluble in water ; the barium salt is
readily soluble, and crystallizes in brilliant hexagonal prisms.
Ethyl Pyrophosphate PgOj(C2HB)4, obtained by the action of ethyl
iodide on silver pyrophosphate, is a viscid liquid.
Ethyl Phosphite3.--Ry aoting with phosphorus trichloride on absolute
alcohol or sodium ethylate, triethyl phosphite TOa(Cfi6)3 is
formed, a liquid boiling at 191° and possessing a disagreeable odour.
By avoiding an excess of alcohol the first product of the reaction
consists of P(O02H0Ol2, a limpid liquid boiling at 117°; water
decomposes it with the formation of alcohol, phosphorous acid, and
hydrochloric acid.
EthylphospTiortm Add a rr s fPOs.—This monobasic acid is pro-