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End point of an iodine titration. 3 of 5.

End point of an iodine titration. 3 of 5.

C029/1102

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Credit

MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY

Caption

Finding the end point of an iodine titration. The titrant, a standard thiosulfate solution, is titrated against the iodate solution until it turns pale yellow. Starch is added to turn it a very dark blue which sharpens the end point. Continue titrating.

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