The Students' Guide in Quantitative Analysis - Free Ebooks Library

122
QUANTITATIVE ANALYSIS.
syrup 5 to lO c. c. basic acetate of lead ; for raw sugar less ;
for pure sugar, none. Dilute to lOO c. c, ; pour into a
beaker, and add piilverizeci bone-black, and filter ; do not
wash. Fill the tube of a Soleil or Dubosq Saccharimeter
with this solution, perfectly full, insert the tube, and
observe the transition tint. For details, sec Atkinson's
translation of Ganot's Physics, § 613. Cf. Fowncs' Chem-
istry, p. 84, and Watts' Diet. iii. 673-5.
Analysts of a sample of Raw Sugar.
Water, ... . , 2.07
Ash, . . . . . . . 1.58
Grape Sugar, . , . , . 1,82
Cane Sugar 86.00
Analysis No. 37. — Petroleum.
For information as to the composition and refining of
petroleum, the products which it yields by distillation, and
the methods of testing kerosene, see Dr. C. F. Chandler's
" Report on Petroleum Oi!" in the " American Chemist,"
Vol. 11. pp. 409, 446, and Vol. III. pp. 20 and 41.
A.—Distillation of Petroleum.
The method of examining crude petroleum for determi-
nation of its commercial value, is not that of fractional
distillation in its true, scientific sense, but consists in a
process of distillation wliich separates the liquid into a
certain number of aliquot parts, having determinable den-
sities, and flashing points ; and the value of the sample
depends upon the proportion of the light and heavy pro-
ducts.
The process of distillation is conducted as follows. Select
a tubulated retort of strong glass, free from flaws, and