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Formation of bromine in a redox reaction, 2 of 3

Formation of bromine in a redox reaction, 2 of 3

C036/3943

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50.2 MB (3.4 MB compressed)

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29.0 x 43.4 cm ⏐ 11.4 x 17.1 in (300dpi)

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Credit

GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY

Caption

Formation of bromine in a redox reaction, 2 of 3. Orange-brown bromine gas (Br2) forms when concentrated (18M) sulfuric acid (H2SO4) is added to white solid potassium bromide (KBr) in a test tube. The initial reaction forms hydrogen bromide gas (HBr), which is then oxidized by the sulfuric acid to form bromine gas (Br2). The two reactions are: KBr + H2SO4 -> HBr + KHSO4 and HBr + H2SO4 -> Br2 + SO2 + H2O. The combined reaction is: KBr + H2SO4 -> KHSO4 + Br2 + SO2 + H2O. The orange-?brown vapour is hydrogen bromide contaminated with the brown colour of bromine.

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