Titration to find the concentration of an iodine solution, using sodium thiosulfate of a known concentration
- a known volume of oxidising agent (such as potassium iodate (V)) is reacted with iodide ions in excess potassium iodide solution to liberate iodine
- IO3-(aq) + 5I-(aq) → 3I2(aq) + 3H2O(l)
- the iodine formed is titrated with thiosulfate to determine the purity of the potassium iodate (V)
- I2 + 2S2O32- → S4O62- + 2I-
- starch is used as an indicator just before the end point to prevent a complex from forming (turns from blue/black to colourless)
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