The Students' Guide in Quantitative Analysis - Free Ebooks Library

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QUANTITATIVE ANALYSIS,
The method of conducting an ultimate analysis is suffi.
ciently detailed in Fresenitis* System, § 171-189, yet the
following summary may be of service in calling attention
to the chief points.
A. Determination of C, H, and O, in Sugar.
Select a very pure well crystallized sample of sugar, rock-
candy will do, but small crystals from a vacuum pan are
better. Dry at loo*^ C, in powder.
Provide thefollowing articles :—
(i) The dried substance in a tared watch glass.
(2) Combustion tube of hard glass drawn out as shown
in Fres. § 174, cleaned and carefully dried.
(3) Liebig potash bulb filled with a KHO solution of
Sp. gr. 1.27, or a U-tube filled with soda-lime.
(4) Chloride of Calcium tube; that of the form described
by Thorpe in
advantageous.
his Quant. Chcm. Analysis page 347, fig. 80 is
(5) Small U-tube containing potash-pumice in one limb
and CaCl3 in the other.
(6) Rubber tubing.
(7) Fine wire for binding the tubing.
(8) Good corks, free from holes, rolled and pressed.
(9) Cupric oxide, granulated preferred, chemically pure,
freshly ignited to remove organic matter and moisture, and
contained in a corked holder.
(10) A platinum boat to contain the substance, or if
another process be followed, a mixing wire.
(it) Combustion furnace,
(12) If oxygen is to be employed, a cylinder of this gas
and a system of drying U-tubcs must be provided.