Chemical lecture experiments . n sulphide is expelled. H2S2 = H2S + S. 32. Reduction of silver oxide.—Hydrogen persulphide,like hydrogen peroxide, reduces silver oxide. A few centi-grams of silver oxide are allowed to fall upon 2 drops ofhydrogen persulphide in a dry test-tube. The reaction isvigorous. SULPHUR MONOCHLORIDE 33. Preparation by the action of chlorine on sulphur. — Dry chlorine acts on sulphur with the production of a yel-low, oily liquid, sulphur monochloride. A 400 cc. tubulated retort is one-third filled with flowersof sulphur. Dry chlorine is conducted through a glass elbow in
Chemical lecture experiments . n sulphide is expelled. H2S2 = H2S + S. 32. Reduction of silver oxide.—Hydrogen persulphide,like hydrogen peroxide, reduces silver oxide. A few centi-grams of silver oxide are allowed to fall upon 2 drops ofhydrogen persulphide in a dry test-tube. The reaction isvigorous. SULPHUR MONOCHLORIDE 33. Preparation by the action of chlorine on sulphur. — Dry chlorine acts on sulphur with the production of a yel-low, oily liquid, sulphur monochloride. A 400 cc. tubulated retort is one-third filled with flowersof sulphur. Dry chlorine is conducted through a glass elbow inserted in the tubulature,and the neck of the retortis thrust into a filter bottle,whose side tube is connectedwith a draft (Fig. 66). Pro-vision should be made forheating the sulphur andcooling the receiver. Thesulphur is strongly heated,and the chlorine currentmaintained at a rapid tube conducting thechlorine should be lowered so as to almost touch the sur-face of the melted sulphur. After a few cubic centimeters. ^—, 7 11 Fig. 66 SULPHUR DIOXIDE 149 of the chloride have collected in the receiver the operation should be stopped. 2 S + Cl2 = S2C12. 400 cc. tubulated retort; filter-flask ; S flowers ; CI generator. 34. Solubility of sulphur in sulphur monochloride. — A few pieces of sulphur are placed in a test-tube and cov-ered with sulphur monochloride. By shaking, or morerapidly by gentle boiling, the sulphur is completelydissolved. 35. Decomposition by water. — Sulphur monochloride,when allowed to stand in contact with water, is graduallydecomposed with the liberation of sulphur and hydrogensulphide. One cubic centimeter of sulphur monochloride isplaced in a test-tube with 2 or 3 cc. of water and vigorouslyshaken. The decomposition is rapid and the contents ofthe tube become warm. SULPHUR DIOXIDE AND SULPHUROUS ACID PREPARATION 36. From sulphur and oxygen. — Sulphur burns in theair or in pure oxygen to form sulphur dioxide. A 40 cm. length of combustion-
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