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Chemistry · L3 · Iodometric Titration — the Starch Endpoint

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How the blue-black starch–iodine complex breaks apart into a colourless solution as thiosulfate consumes the last of the iodine.

by @openstemUpdated Chemistry
Solution contains iodine, I2, generated by the analyteAdd starch indicator near the expected endpointStarch + I2 forms an intense blue-black complexTitrate with sodium thiosulfate, drop by dropIs iodine still present?Thiosulfate reduces I2 to colourless I-blue-black colour persistsBlue-black complex breaks apartSolution turns colourless — endpoint reachedYesNo — last of the I2 just consumed

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