A popular chemistry; . chief consumption is in the produc-tion of H2S04. Compounds.—Sulphur Dioxide, S02, an irrespirable,suffocating gas, is formed by S burning in the air,as in the lighting of a match. It is prepared forexperiments by treating copper with strong heating, S02 is evolved and may be collected likeCI by displacement. The action of the acid on thecopper is represented thus: Cu + 2H2S04 = CuS04 + 2H20 + S02. S02 is more than twice as heavy as air. It is readilysoluble in water, forming a solution which is be-lieved to contain H2S03, sulphurous acid. When this is neutraliz
A popular chemistry; . chief consumption is in the produc-tion of H2S04. Compounds.—Sulphur Dioxide, S02, an irrespirable,suffocating gas, is formed by S burning in the air,as in the lighting of a match. It is prepared forexperiments by treating copper with strong heating, S02 is evolved and may be collected likeCI by displacement. The action of the acid on thecopper is represented thus: Cu + 2H2S04 = CuS04 + 2H20 + S02. S02 is more than twice as heavy as air. It is readilysoluble in water, forming a solution which is be-lieved to contain H2S03, sulphurous acid. When this is neutralized by bases ityields salts called 2 extinguishes our chimney burns at anytime, we can easily quench theflame by burning a little S inthe stove or on the hearth. Uses.—SO 2 is used for bleach-ing silk, straw, and woolenfabrics, which are destroyed byCI. Its action is very differentfrom that of CI, and depends upon the power it hasof withdrawing 0 from substances or reducing them, Fig. Bleaching SULPHUR. 105 as it is called. This takes place in the presence ofmoisture, and the result is that the S02 with H20and the 0 forms sulphuric acid, H2S04. The reducingaction of S02 is made use of in the manufacture ofpaper, to destroy the excess of CI after bleaching: S02 + Cl2 + 2H20 = H2S04 + 2HC1. S02 is called on this account an anti-chlor. The bleaching effected by S02 is not permanentlike that by CI. The color is often restored by ex-posure to the air or by alkalies. S is also frequentlyemployed to check fermentation, as when it is burnedin a barrel before filling with new cider. Sulphur Trioxide, S03, may be prepared by theoxidation of S02 in the presence of platinum is often called sulphuric anhydride* If Nord-hausen acidf be heated, the vapors may be con-densed in a mass of silky, crystalline fibers of will shoAv no acid reaction, will not redden bluelitmus-paper, and, if the fingers are dry, can bemolded like wax. If it be dro
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Keywords: ., bookcentury1800, bookdecade18, booksubjectchemistry, bookyear1887
