Laboratory Studies in Elementary Chemistry

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 Excerpt: ...was used in Exp. 61, and with that given off by zinc and dilute sulphuric acid. EXPERIMENT 63. Object.--To collect and examine the gas which zinc liberates from cold dilute nitric acid. Manipulation and Notes Arrange a side-neck flask with delivery tube, water pan, and bottle, to collect the gas by displacement of water (Fig. 11, p. 22). Dilute 25 cc. of nitric acid with 100 cc. of water. Put several pieces of zinc into the generator, and when the acid is cold pour it upon the zinc. Close the flask, wait a full minute, and then proceed at once to collect the gas. The generator should be kept cool; it may very well be supported in a dish of cold water. Finally take the tube from the water, and then test the gas with air and with flame. Does it change by contact with air? Lift the bottle enough to let bubbles of air enter (note). How does it act with flame? Open the generator, and apply the flame test in the usual way. General--There are several compounds of nitrogen and oxygen. One is a colorless gas which promotes combustion, called nitrous oxide; another is a colorless gas which extinguishes a taper flame, called nitric oxide; while another is a red-brown gas, called nitrogen peroxide. What gas is set free when zinc or copper acts on moderately strong nitric acid? What other gas is produced when this one mixes with air (or oxygen)? What gas is set free when zinc acts on cold dilute nitric acid? EXPERIMENT 64. Object.--To study the action of zinc on very dilute nitric acid in presence of sulphuric acid. Manipulation and Notes.--Dilute 1 cc. of sulphuric acid with 5 cc. of water, and when cold pour it upon zinc in a test tube. Keep it cold by inserting it in cold water. Test the gas. Add drop by drop a mixture of 1 cc. of nitric acid with 3 cc. of water, and...