. Practical physical chemistry . up as shown in Fig. 98. The side tube, a, of the round-bottomed distilling flask is connected with a condenser bymeans of a piece of rubber tubing having a screw clip, a rubber stopper in the neck of the flask passes aglass tube, b, which reaches nearly to the bottom of the other end of the tube is closed by rubber tubing anda clip. While the liquid is being boiledj the clip on the tube b is Fig. 97. 296 PRACTICAL PHYSICAL CHEMISTRY closed, while there is free connection with the the liquid has been boiled sufficiently long (
. Practical physical chemistry . up as shown in Fig. 98. The side tube, a, of the round-bottomed distilling flask is connected with a condenser bymeans of a piece of rubber tubing having a screw clip, a rubber stopper in the neck of the flask passes aglass tube, b, which reaches nearly to the bottom of the other end of the tube is closed by rubber tubing anda clip. While the liquid is being boiledj the clip on the tube b is Fig. 97. 296 PRACTICAL PHYSICAL CHEMISTRY closed, while there is free connection with the the liquid has been boiled sufficiently long (10-15 niins.)-the clip c is closed and the flame at the same time removedAfter the liquid has cooled down to the ordinary temperaturethe flask is inverted and connected, by means of the side tube,with the lower outlet tube of the absorption pipette. Theabsorption pipette is exhausted by means of a pump attachedto the tube b of the absorption pipette and the taps thenclosed. The clip on the tube b of the distillation flask is now. Fig. 98. opened in order to bring the interior of the flask to atmo-spheric pressure, and then, as soon as possible, the clip c isopened and also the lower tap of the absorption pipette. Thesolvent is then drawn into the pipette from the bottom of theliquid in the boiling flask, to which the air admitted into theflask will not have had time to diffuse. Experiment.—Determine the Solubility of Carboti Dioxidein Water «/ 25. DETERMINATION OF SOLUBILITY 297 The apparatus having been fitted together, the absorptionpipette, filled with air-free water, is placed in a thermostat at25°. The mercury in the measuring burette is raised until itcompletely fills the burette, and a current of moist carbondioxide from a Kipp apparatus is allowed to pass through themetal connecting tube and to escape into the air throughthe three-way tap on the absorption pipette. When all theair has been swept out, the tap a is turned and the burettefilled with carbon dioxide. Aft
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