Chemical lecture experiments . stinct yellow coloration will appear even at thisgreat dilution. NaN02 ; phenylenediamine solution. NITROGEN PEROXIDE PREPARATION 64. By ignition of lead nitrate. — Lead nitrate on ignitionis decomposed into lead monoxide, nitrogen peroxide, andoxygen. Nitrogen peroxide, being easily condensed, is re-tained in a U-tube packed in salt and ice, while the oxygenis collected at the pneumatic trough. Fifty grams of previously dried lead nitrate are placed ina 200 cc. Jena glass distilling flask, connected to one limbof a U-tube packed in ice andsalt; the other limb is
Chemical lecture experiments . stinct yellow coloration will appear even at thisgreat dilution. NaN02 ; phenylenediamine solution. NITROGEN PEROXIDE PREPARATION 64. By ignition of lead nitrate. — Lead nitrate on ignitionis decomposed into lead monoxide, nitrogen peroxide, andoxygen. Nitrogen peroxide, being easily condensed, is re-tained in a U-tube packed in salt and ice, while the oxygenis collected at the pneumatic trough. Fifty grams of previously dried lead nitrate are placed ina 200 cc. Jena glass distilling flask, connected to one limbof a U-tube packed in ice andsalt; the other limb is fittedwith a cork and a delivery-tubeleading to the pneumatic trough(Fig. 91). The neck of the dis-tilling flask is securely corked,and the lead nitrate carefullyheated with a Bimsen all the air has been drivenout of the apparatus, the oxy-gen may be collected and testedat the pneumatic trough. On disconnecting the apparatus, the impure nitrogen peroxidewill be found as a red liquid condensed in the U-tube. The. Fig. 91 220 CHEMICAL LECTURE EXPERIMENTS lead nitrate used for this experiment should be dried byheating in a porcelain evaporating-dish till red fumes just-appear. 200 cc. Jena glass distilling-flask ; U-tube in freezing-mixture ; driedpulverized Pb(N03)2. 65. By the action of tin on concentrated nitric acid. — Tin and nitric acid react vigorously, nitrogen peroxide beingevolved. The bottom of a 300 cc Erlenmeyer flask is covered withgranulated tin, and strong nitric acid is introduced througha thistle-tube reaching to the bottom of the flask. A glasselbow thrust through the cork in the neck of the flask isconnected to a gas washing-bottle, which is in turn con-nected with a U-tube immersed in a freezing-mixture ofsalt and ice. As soon as the acid is added, the reaction be-gins and great heat is developed. Most of the steam formedis condensed in the gas washing-bottle. The nitrogen per-oxide is condensed in the U-tube. By disconnecting theU-tube and c
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