MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Finding the end point of an iodine titration. The titrant, a standard thiosulfate solution, is titrated against the iodate solution. Starch is added part way through to turn it blue and sharpen the end point. When the solution becomes a pale blue the end point is very close.
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