Finding end point of an iodine titration.

Finding end point of an iodine titration.

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Finding the end point of an iodine titration. At the start of an iodine titration the solution is brown in colour. The titrant, a standard sodium thiosulfate solution of known molarity, is titrated against the iodate solution until it becomes a pale yellow. To help to find an exact end point add a few drops of starch solution to turn it a very dark blue which sharpens the end point. Continue titrating. When the solution becomes a pale blue the end point is very close. The end point occurs when the last trace of blue disappears. The solution is now clear.

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Keywords: color, colour, end point, iodate solution, iodine titration, iodometric titration, iodometry, known molarity, no-one, nobody, redox titration, sodium thiosulfate, standard solution, starch solution, titrant, titrated, titrating, volumetric chemical analysis

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