A college text-book of chemistry . Fig. 36. 144 COLLEGE CHEMISTRY. Formation of Hydrochloric Acid. Experiment 71.—Light a jet of hydrogen in the air and care-fully introduce it into a vessel containing chlorine. It will con-tinue to burn, but the flame will not appear the same. A gaswill be given off which forms clouds in the air. This gas has asharp, penetrating taste and smell. Experiment 72.—Half fill a small, wide-mouthed cylinder oversalt water with chlorine gas. Then fill it with hydrogen. Thedirect sunlight must not shine upon the cylinder while it containsthe mixture. Turn it mouth upw
A college text-book of chemistry . Fig. 36. 144 COLLEGE CHEMISTRY. Formation of Hydrochloric Acid. Experiment 71.—Light a jet of hydrogen in the air and care-fully introduce it into a vessel containing chlorine. It will con-tinue to burn, but the flame will not appear the same. A gaswill be given off which forms clouds in the air. This gas has asharp, penetrating taste and smell. Experiment 72.—Half fill a small, wide-mouthed cylinder oversalt water with chlorine gas. Then fill it with hydrogen. Thedirect sunlight must not shine upon the cylinder while it containsthe mixture. Turn it mouth upward and apply a flame. Preparation of Hydrochloric 73.—Arrange an apparatus as shown in Fig. Fig. 37. Weigh out 5 parts common salt, 5 parts concentrated sul-phuric acid, and 1 part water. Mix the acid and water, takingthe usual precautions ; let the mixture cool down to the ordinarytemperature, and then pour it on the salt in the flask. For thepurposes of the experiment take about 20 grams of salt. Nowheat the flask gently, and the gas will be regularly evolved. Con-duct it at first over water contained in the two WoulfPs the air has been displaced, the gas is all absorbed as soon asit comes in contact with the water.—After the gas has passed forten to fifteen minutes, disconnect at A. Notice the fumes. Thesebecome denser by blowing the breath on them. Why ?—Apply alighted match to the end of the tube. Does the gas burn?— HYDROCHLORIC ACID: EXPERIMENTS. 145 Collect some of the gas in a dry cylinder by displacement of air,as in the case of chlorine. The specific gravity of the gas , the vessel must of course be placed with the mouth the
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