How To: Make an Iodine Clock Reaction at Home

Make an Iodine Clock Reaction at Home

In this video, I'll be demonstrating how anyone can make their own iodine clock reaction with simple over-the-counter chemicals.

Household Materials Needed

  • Hydrochloric acid (for cleaning purposes)
  • Hydrogen peroxide (3%)
  • Sodium hydroxide (drain cleaner)
  • Povidone-iodine (antiseptic)
  • Cornstarch
  • Sodium thiosulphate (used as water conditioner for fish bowls, but I got mine from a children's chemistry game)

The Reactions

In the first, slow reaction seen in the video above, triiodide ion is produced:

  • H2O2 + 3 I- + 2 H+ -> I3- + 2 H2O

In the second, fast reaction, triiodide is reconverted to iodide by the thiosulfate:

  • I3- + 2 S2O32- -> 3 I- + S4O62-

The color of the solution after the reaction is a result of the complex formed between iodine and starch that has dark blue color.

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.

Buy Now (97% off) >

Our Best Phone Hacks

Gadget Hacks' tips — delivered daily.

Be the First to Comment

Share Your Thoughts

  • Hot
  • Latest