Or you want a quick look:
This is an oxidation-reduction (redox) reaction:
4 SII - 2 e- → 4 S5/2 (oxidation)
2 I + 2 e- → 2 I-I (reduction)
Na2S2O3 is a reducing agent, I2 is an oxidizing agent.
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Reactants:
- Na2S2O3
- Names: Sodium thiosulfate , Sodium hyposulfite , Hyposulphite of soda
- Appearance: White crystals ; Colourless crystals
- I2
- Names: Iodine , Jod , Iode
- Appearance: Bluish black or dark purple crystals with pungent odour ; Violet solid with a sharp, characteristic odor.
Products:
- Na2S4O6
- Names: Sodium tetrathionate
- NaI
- Names: Sodium iodide , Sodium iodide (anhydrous) , NaI , Sodium monoiodide
- Appearance: White solid | deliquescent ; Colourless-to-white hygroscopic crystals or white powder. turns brown on exposure to air
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