This clock reaction uses sodium, potassium or ammonium persulfate to oxidize iodide ions to iodine. Sodium thiosulfate is used to reduce iodine back to iodide before the iodine can complex with the starch to form the characteristic blue-black color. Follow us 👉 @sciencefunn for more science and daily facts.🤓 Enjoy the rest of your day.😇 This content has been shared using Instagram Remix/Sequence feature from the content owner @rebecca1227_ via @pubity | Science Is Fun For Everyone

The redox reaction behind iodometric titration: iodine and sodium thiosulfate. • Sodium thiosulfate, Na₂S₂O₃, is a white crystalline solid that dissolves in water, giving us the thiosulfate anion, S₂O₃²⁻, which is acting as a reducing agent in this demonstration. • Elemental iodine is slightly soluble in water, so in this brown coloured lugol’s iodine we have here it is mixed with potassium iodide to increase solubility via the formation of triiodide ions, I₃⁻ in the following exergonic equilibr