Making iodine | Summary and Q&A

TL;DR

Iodine is extracted from iodine povidone solution, purified using sodium hydroxide and hydrochloric acid, and then collected through evaporation.

Key Insights

• ❓ Iodine is an essential element in producing thyroid hormones, which influence metabolism.
• 💁 It can be extracted from iodine povidone solution using sodium hydroxide to form a complex.
• ❓ Hydrochloric acid is used to convert the complex back into iodine that can be precipitated and collected.
• 🔮 The collected iodine can be purified through evaporation to obtain pure iodine crystals.
• 💜 Sodium thiosulfate can be used to clean and remove the purple color of iodine from equipment.
• 👻 The extraction and purification process allows for the production of elemental iodine for various purposes, such as disinfection and chemical reactions.
• ⏰ The iodine clock reaction, a variation of which was accidentally performed during the purification process, is a notable chemical reaction involving iodine and hydrogen peroxide.

Transcript

iodine is an element with a bluish black color and it's a member of the halogen family other common members in the halogen family are fluorine chlorine and bromine in higher animals like humans iodine plays an essential role and it's needed to make thyroid hormones these hormones are extremely important because they control the metabolic rate of th... Read More

Questions & Answers

Q: What is the role of iodine in the human body?

Iodine is needed to produce thyroid hormones, which control the metabolic rate of organisms. Without sufficient iodine, there can be detrimental effects on human health.

Q: How is iodine extracted from iodine povidone solution?

Sodium hydroxide is added to the solution, resulting in the formation of a complex between the iodine and the Povidone polymer. The complex is then filtered out, and the iodine is separated by converting it into sodium iodide.

Q: Why is hydrochloric acid added in the process?

Hydrochloric acid is added to neutralize the sodium hydroxide and convert the sodium iodide back into iodine. The reaction between hydrochloric acid and the sodium iodide produces sodium chloride, iodine, and water.

Q: What is the purpose of evaporating the iodine solution?

Evaporating the solution helps concentrate the iodine and allows it to precipitate out. The iodine crystals can be collected and purified through this process.

Summary & Key Takeaways

• Iodine is a bluish-black element that plays an essential role in producing thyroid hormones in higher animals, including humans.

• Iodine can be extracted from iodine povidone solution and used as a disinfectant in the medical field.

• The extraction process involves adding sodium hydroxide to the iodine povidone solution, filtering out the resulting complex, and then precipitating and collecting the iodine through evaporation.