High School Chemistry . of the test-tubes full of the gas and placeit, mouth downwards, in a vessel containing a cold solu-tion of copperas (ferrous sulphate), FeSO^. Vary this experiment as follows :— Pour some well-cooled solution of ferrous sulphate,FeS04, into a beaker full of the gas ; then hold the handover the beakers mouth and shake vigorously. Notethe two phenomena that occur. * The air may readily be driven into the tube by using an empty flask fitted uplike the one in figure 25. When water is poured down the funnel, air is forced outthrough the delivery tube. 92 MTUIC OXIDK. 4.—Note
High School Chemistry . of the test-tubes full of the gas and placeit, mouth downwards, in a vessel containing a cold solu-tion of copperas (ferrous sulphate), FeSO^. Vary this experiment as follows :— Pour some well-cooled solution of ferrous sulphate,FeS04, into a beaker full of the gas ; then hold the handover the beakers mouth and shake vigorously. Notethe two phenomena that occur. * The air may readily be driven into the tube by using an empty flask fitted uplike the one in figure 25. When water is poured down the funnel, air is forced outthrough the delivery tube. 92 MTUIC OXIDK. 4.—Notes on Nitric Oxide. Nitric oxide: forvmla, NO; Diolccular zveight, jo;vapour density, 75. Nitric oxide condenses to a liquid at—ii°C. and apressure of 104 atmospheres. It does not unite withwater to form an acid. One test for this g;is is itsreaction with air or free ox)^gen ; another is that witha, solution of ferrous sulphate a dark ring or layer isformed on the liquid, as seen in ex. 4, in the 5.—Composition by Volume of Nitrous Oxideand Nitric Oxide. Prepare a hard glass tube, bent asA in the Fig. 28. Fill this withwashed nitrous oxide gas, having>t previously dropped into the tube apiece of sodium, or of potassium,about as large as a pea. Dip themouth of the tube, when filled withgas, under mercury, and by jarringit, get the sodium into a position just below A. Thenheat it strongly. The hot sodium decomposes thenitrous oxide to form oxide of sodium and the nitrogenis left. The volume of the nitrogen should be the sameas that of the original gas. Nitric oxide may be decomposed in the same way,but the volume of nitrogen in this case is only one-halfthat of the oxide taken. Fig. 28. KlTROGEN TRIOXIDE. 92 G.—Questions and Exercises. 1. Pass nitrogen into nitric oxide. 2. Is it the air as a whole, or one of the constituents of it, thatcauses the brown coloured gas to appear with nitric oxide ? 3. What reasons have you for believing that nitric ox
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