Chemical lecture experiments . umes of hydrogen andchlorine is shown by allowing a strong solution of potassiumiodide to flow through the stop-cock into the gas. Thesolution immediately becomes dark-colored from the libera-tion of iodine, and the liquid will rise inside the tube half-way to the stop-cock. If the eudiometer is then invertedand the residual gas tested, it will be found to burn quietly,giving the hydrogen name. Eudiometer filled with II and CI from the preceding experiment;KI solution. CHLORINE MONOXIDE 27. Preparation. — AVhen chlorine is passed over yellowmercuric oxide, the br
Chemical lecture experiments . umes of hydrogen andchlorine is shown by allowing a strong solution of potassiumiodide to flow through the stop-cock into the gas. Thesolution immediately becomes dark-colored from the libera-tion of iodine, and the liquid will rise inside the tube half-way to the stop-cock. If the eudiometer is then invertedand the residual gas tested, it will be found to burn quietly,giving the hydrogen name. Eudiometer filled with II and CI from the preceding experiment;KI solution. CHLORINE MONOXIDE 27. Preparation. — AVhen chlorine is passed over yellowmercuric oxide, the brownish oxychloride of mercury to-gether with chlorine monoxideis formed. A slow stream of chlorine ispassed through a piece of glasstubing, 50 cm. long and 8 to10 mm. internal diameter, whichis bent at right angles at a dis-tance of 10 cm. from one end(Fig. 48). Dry mercuric oxide (the yellow amorphousmodification) is placed in the tube, which is clamped in ahorizontal position, the elbow dipping into a small cylin- -*>=m. Fig. 48 HYPOCHLOROUS ACID 99 der. That portion of the tube containing the mercuric oxideis kept cool by allowing ice-water to drop on a piece of filter-paper laid upon it. In a few minutes the cylinder will befilled with a brownish yellow gas. Several cylinders of thesame size should be filled. A small quantity of chlorine monoxide is exploded bythrusting a burning match or hot iron wire into the mouthof a cylinder. Sulphur flowers are sifted into a cylinder of chlorine mo-noxide. The reaction follows with an explosion. A 2 or 3 mm. piece of phosphorus placed in a smalldeflagrating spoon is lowered into a jar of the gas. An ex-plosion takes place. Glass tube 50 cm. long, 8-10 mm. internal diameter; several smallcylinders; ice-water ; CI generator; HgO (yellow) ; S flowers ; P. HYPOCHLOROUS ACID PREPARATION 28. By the action of chlorine on mercuric oxide. — Moist,freshly precipitated mercuric oxide is covered with strongchlorine water. The oxide soon di
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