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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