A college text-book of chemistry . EXPERIMENTS WITH NITRIC ACID. 293 has already been used, and let this in gradually. Leave the stop-cock closed, and fill the funnel with dilute sulphuric acid. Fit abent tube into a cork; fill this tube with dilute sulphuric acid ;put the cork in the funnel, and the other end of the tube in asmall beaker containing dilute sulphuric acid, and, after immers-ing the long tube in water of the ordinary temperature, open thestop-cock. If the operation has been carried out as it shouldbe, the dilute acid will flow into the tube until it is two-thirdsfull, and will t
A college text-book of chemistry . EXPERIMENTS WITH NITRIC ACID. 293 has already been used, and let this in gradually. Leave the stop-cock closed, and fill the funnel with dilute sulphuric acid. Fit abent tube into a cork; fill this tube with dilute sulphuric acid ;put the cork in the funnel, and the other end of the tube in asmall beaker containing dilute sulphuric acid, and, after immers-ing the long tube in water of the ordinary temperature, open thestop-cock. If the operation has been carried out as it shouldbe, the dilute acid will flow into the tube until it is two-thirdsfull, and will then stop. The residual gas is nitrogen. Whatevidence in regard to the composition of ammonia is furnishedby this experiment ? The arrangement of the apparatus in the last stage of the ex-periment is shown in Fig. 53. Preparation and Properties of Nitric Acid. Experiment 131.—Arrange an apparatus as shown in Fig. the retort put 20 grams sodium nitrate (Chili saltpetre) and 20. Fig. 54. grams concentrated sulphuric acid. On gently heating, nitricacid will distil over, and be condensed in the receiver.—What re-action takes place ?—After the acid is all distilled off, remove thecontents of the retort. Kecrystallize the substance from water,and compare it with the sodium sulphate obtained in the prepara-tion of hydrochloric acid. (See Experiment 74.) In the latter stageof the operation the vessels become filled with a reddish-browngas. The acid which is collected has a somewhat yellowish Experiment 132.—Mix together 4o0 grams concentrated sul-phuric acid and 85 grams ordinary concentrated nitric acid. 294 COLLEGE CHEMISTRY. Pour the sulphuric acid into the nitric acid. Distil the mixturefrom a retort arranged as in the preceding experiment, takingcare to keep the neck of the retort cool by placing filter-papermoistened with cold water on it. Use the acid thus obtained forthe purpose of studying the properties of pure nitric acid. Nitric Acid gives
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