Chemical lecture experiments . g from the glasselbow in the flask of the preceding experiment is ignitedand the size of the flame regulated by the temperature ofthe water in the beaker. Iron wires which have beentwisted together are inserted in the flame. The moltenglobules of iron sulphide formed may be tested with hydro-chloric acid, and the evolution of hydrogen sulphide shown. 100 cc. flask ; beaker of hot water ; cork and elbow ; CS2 ; bundleof fine iron wires. METHANE (xMARSH GAS) 48. Preparation from sodium acetate. — Sodium acetate,when heated in the presence of soda-lime, decomposes,
Chemical lecture experiments . g from the glasselbow in the flask of the preceding experiment is ignitedand the size of the flame regulated by the temperature ofthe water in the beaker. Iron wires which have beentwisted together are inserted in the flame. The moltenglobules of iron sulphide formed may be tested with hydro-chloric acid, and the evolution of hydrogen sulphide shown. 100 cc. flask ; beaker of hot water ; cork and elbow ; CS2 ; bundleof fine iron wires. METHANE (xMARSH GAS) 48. Preparation from sodium acetate. — Sodium acetate,when heated in the presence of soda-lime, decomposes, lib-erating methane or marsh gas. Fifteen grams of fused so-dium acetate are pulverizedand mixed with an equalweight of fused mixture is placed in a100 cc. Jena glass Erlenmeyerflask fitted with a one-holedcork and a wide delivery-tube(Fig. 128). The flask is grad-ually heated and, after all air has been driven out, the gas is collected in several cylindersfor use in the following experiments. The importance of. ^ ?? jfpEz k\\ — o — ? -W 0 oO — Fig. 128 320 CHEMICAL LECTURE EXPERIMENTS having water-free materials cannot be too strongly empha-sized, as condensed water is likely to break the flask. 100 cc. Jena glass Erlenmeyer flask ; pneumatic trough ; severalcylinders ; fused sodium acetate ; fused soda-lime. 49. Marsh gas a non-supporter of combustion. — A burn-ing candle thrust into an inverted cylinder of marsh gas isimmediately extinguished. Candle on wire ; liter cylinder of CH4. 50. Explosion with oxygen. — Two volumes of oxygenand 1 volume of marsh gas are introduced into a thick-walled 100 cc. cylinder having a cardboard cover with a5 mm. hole in the centre. On igniting the mixture, a strongexplosion will be obtained. A thick-walled cylinder or around-bottomed ginger-ale bottle should be used for thisexperiment, and as a special safeguard the vessel should bewrapped with a towel. 100 cc. stout-walled cylinder rilled | with CH4 and § with O. E
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