Watch this science video tutorial from Nurd Rage on how to make iodine from sulfuric acid and alkali metal iodide. This is the best way to make elemental iodine from sulfuric acid and sodium or potassium iodide.
Warning: Reaction must be done outside or in a fumehood due to production of toxic gases including hydrogen sulfide.
First, get your sodium or potassium iodide and completely dissolve it in a minimum of water. Then place it into an ice bath to keep it cold.
Second, add concentrated sulfuric acid directly to the solution and constantly stir. As you add it will produce iodine.
At first the mixture will become pasty and eventually liquefy.
Once it's liquefied, pour it directly into cold water (the ice bath itself is useful for this) and stir it up. Then let it settle for ten minutes or so.
The iodine will settle to the bottom so pour off the water and acid.
The iodine will still be contaminated with acid so you'll need to add water and pour off several times to get out most of the acid.
Filter it and now you have a solid plug of iodine.
It's usable as-is for most purposes but you can purify by placing it in a beaker with a ice-filled round bottom flask on top. Then heat the beaker. The iodine will vaporize and deposit on the flask.
A cool reaction is to take some iodine and pour magnesium powder over it. It will react to form a purple cloud of iodine vapor. If it doesn't react quickly enough, just add a drop of water.
Brought to you by one of WonderHowTo's favorite scientists NurdRage.
Want to master Microsoft Excel and take your work-from-home job prospects to the next level? Jump-start your career with our Premium A-to-Z Microsoft Excel Training Bundle from the new Gadget Hacks Shop and get lifetime access to more than 40 hours of Basic to Advanced instruction on functions, formula, tools, and more.
Other worthwhile deals to check out:
- 97% off The Ultimate 2021 White Hat Hacker Certification Bundle
- 98% off The 2021 Accounting Mastery Bootcamp Bundle
- 99% off The 2021 All-in-One Data Scientist Mega Bundle
- 59% off XSplit VCam: Lifetime Subscription (Windows)
- 98% off The 2021 Premium Learn To Code Certification Bundle
- 62% off MindMaster Mind Mapping Software: Perpetual License
- 41% off NetSpot Home Wi-Fi Analyzer: Lifetime Upgrades