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Unformatted text preview: wider capillary (say 2 mm. in diameter) may have to be used. The student should soon be able by experience to select a suitable tube having once obtained the "feel" of the material when crushed on the porcelain. Should the material be inclined to stick in the tube, it can often be rapidly conducted to the bottom by vibrating the tube gently by the cross-wise action of a blunt file or the milled edge of a coin. The usual apparatus for heating the substance is shown in Fig. I(B), and consists of a long-necked hard-glass flask D to which a thermometer E is fitted by means of a cork having a shallow vertical groove F cut or filed as shown to allow expansion of the contents of D. The best liquid for placing in D is medicinal paraffin, which possesses the following very suitable properties: (a) it has a low specific heat and therefore the tem-perature can be easily increased using only a small flame, (b) even when hot it FIG. i. RB |J RB (B)...
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.
- Fall '06
- Organic chemistry