. Chimie physique pratique . e G, dont la partie horizontale peut-être faite de ij à 2 pieds de long; l'extrémité libre de ce tube est ensuite fixée au sommet de la burette à gaz Hempel F, remplie d'eau. IH makingthese connexions, des tuyaux en caoutchouc inde à parois épaisses devraient être utilisés, et les extrémités des deux glasstubes devraient être rapprochées. Le tube B, dont l'extrémité supérieure est un bouchon en caoutchouc Bya fermé, est placé dans le tube plus large A, qui contient un liquide dont le point d'ébullition est à 20°-3° au-dessus du point d'ébullition du liquide à évaporer.^ la bouche OFA est fermée par a

• Contributeur: Reading Room 2020 / Alamy Banque D'Images
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. Practical physical chemistry . e G, the horizontal portion of which maybe made frOm ij to 2 feet long; the free end of this tube is then attached to the top ofa Hempel gas burette F, filled with water. Ih makingthese connections, thick -walled india-rubber tubingshould be employed, andthe ends of the two glasstubes should be brought upclose together. The tube B, the upperend of which is Closed bya rubber stopper, is placedin the wider tube A, whichcontains a liquid the boiling-point of which is at least20°-3o° above the boiling-point of the liquid to bevaporized.^ The mouth ofA is closed by a large corkwith a deep groove cut inone side to allow for ex-pansion of the air in thetube. In order to allow Bto pass through, it^will benecessary to cut the corkin two pieces. To preventbumping, a few pieces ofporous tile, or simila* mate-rial, are placed in A, and the liquid is boiled, the three-way stop-cock H being meanwhile open to the air to allow the expanded A list of suitable heating liquids is given in the Appendix.. Fig. II. DENSITY OF LIQUIDS AND GASES 51 gas to escape. After the liquid in A has been boiling for tenminutes with such vigour that its vapour rises almost to the topof the tube, it is ascertained whether the. temperature in B hasbecome constant, by)turning the tap H so as to make connectionbetween B and the burette. If the temperature has becomeconstant, the level of the water in the burette will remainunchanged. When constant temperature has been attained, the tap H is again opened tb the air, H:he stopper at the end ofB removed, and a weighed Quantity of the liquid to be vaporized, contained in a small stoppered weighing bottle, is dropped onthe flat end of the glass rod passing- through D. The rubberstopper is then replaced, communication between B and theburette made through H, and the bottle with the liquid allowedto drop to the bottom of B by rotating the glass rod. Onreaching the bottom of the tube, the liquid is vaporized, andexpels a volume of a

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