Make iodine from an Alkali metal iodide, hydrochloric acid and hydrogen peroxide.
Warning: This reaction makes small amounts of chlorine gas and should be performed outside or in a fumehood.
Our previous iodine making video: http://www.youtube.com/watch?v=2F_kPXbi2D8
Simply get some potassium or sodium iodide and dissolve in a minimal amount of water. Then add an equal amount of concentrated hydrochloric acid. Check this new volume and measure out five times more 3%hydrogen peroxide. Mix together the two solutions and let stand for ten minutes. Filter the iodine.
You can then purify by vaporization and crystallization.
Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.