File:Iodine clock - persulphate.ogv

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Iodine_clock_-_persulphate.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 6.0 s, 180 × 144 pixels, 98 kbps overall, file size: 73 KB)

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Description
English: Video of iodine clock reaction. Potassium persulphate is used to oxidize iodide ions to iodine, in the presence of starch and a small amount of thiosulphate ions. When the thiosulphate is exhausted (by reaction with the iodine produced), the dark blue iodine-starch complex is formed. The time taken for the blue colour to appear varies with rate of reaction and can be used to study the reaction kinetics.
For the purposes of this video, the reaction is catalysed by Fe2+ ions to drastically shorten the time for the colour change to occur.
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Source Own work
Author TheSmuel

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Date/TimeThumbnailDimensionsUserComment
current21:26, 18 June 20096.0 s, 180 × 144 (73 KB)TheSmuel (talk | contribs){{Information |Description={{en|1=Video of iodine clock reaction. Potassium persulphate is used to oxidize iodide ions to iodine, in the presence of starch and a small amount of thiosulphate ions. When the thiosulphate is exhausted (by reaction with the

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Format Bitrate Download Status Encode time
VP9 240P 62 kbps Completed 10:20, 11 July 2024 4.0 s
WebM 360P 385 kbps Completed 15:59, 30 November 2023 1.0 s
QuickTime 144p (MJPEG) 1.05 Mbps Completed 13:24, 7 November 2024 1.0 s

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