Chemical lecture experiments . mall amount of moisture, hydrogen sulphide reacts withsulphur dioxide, with the liberation of sulphur. This re-action is of especial interest in indicating the deposition ofsulphur in volcanoes. The operation may be carried out inthe simplest manner bj# inverting a cylinder of hydrogensulphide collected over water, mouth downwards, on top of acylinder of equal size, containing sulphur dioxide. Whenthe glass platesjpre slipped from between the two cylinders,the gases unitcwith a heavy deposition of sulphur on thewalls of tl^cylinders. As the sul-phur dioxine is ne
Chemical lecture experiments . mall amount of moisture, hydrogen sulphide reacts withsulphur dioxide, with the liberation of sulphur. This re-action is of especial interest in indicating the deposition ofsulphur in volcanoes. The operation may be carried out inthe simplest manner bj# inverting a cylinder of hydrogensulphide collected over water, mouth downwards, on top of acylinder of equal size, containing sulphur dioxide. Whenthe glass platesjpre slipped from between the two cylinders,the gases unitcwith a heavy deposition of sulphur on thewalls of tl^cylinders. As the sul-phur dioxine is nearly twice as heavyas the hydrogen sulphide, the diffu-sion of the two gases is somewhatslow, and gives an excellent illustra-tion of this phenomenon. In caseit is desired to hasten the action, thecylinders are shaken. The reaction may be shown on amuch more extended scale by con-ducting the two gases from suitablegenerators into a large three-necked Wolff bottle (Fig. 65).Hydrogen sulphide is conducted through one neck of the. Fig. 65 \ 144 CHEMICAL LECTURE EXPERIMEN Wolff bottle, and sulphur dioxide through another. T^ietlyrd neck is fitted with a cork, carrying a glass elbow mni-nected with th^flue. After a few minutes, the whofcinterior of the Wolff bottle becomes coated with a layerof finely divided sulphur. The bottle should be cleaned immediately after use, asthe sulphur, if allowed to dry on the walls of the bottle, isvery hard to remove. The reaction is not altogether assimple as is given in Equation (1) below, as a certain smallquantity of pentathionic acid is formed. (1) S02 + 2 1LS = 2 HX> + 3 S. (2) 5 S02 + 5 II2S = H2S,0« + | + 5 S. Wolff bottle (3-necked) ; H*S generator; 80s generator ; cylinder of II2S ; cylinder of S( >2. (b) The interaction of hydrogen sulphide and sulphur dioxide may also be carried out in wieous solution. Aque-ous solutions of the two gases, when mixed, produce a heavyprecipitate of sulphur. By conducting hydrogen sulphide into
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