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You can react chemicals to produce what looks like a thunderstorm in a test tube. This is a spectacular chemisty demonstration that is suitable for chemistry class or lab.

Test Tube Thunderstorm Safety

This demonstration involves corrosive acid, flammable alchohol or acetone, and a slight chance of glassware shattering as a result of the vigorous chemical reaction. The test tube thunderstorm demonstration should only be performed by qualified individuals, wearing full protective gear and using proper safety precautions.

Test Tube Thunderstorm Materials

  • 95% alchohol or acetone
  • sulfuric acid
  • potassium permanganate
  • glass pipette
  • test tube

Perform the Test Tube Thunderstorm Demonstration

Wear gloves, a face shield, and protective clothing.
  1. Pour some alcohol or acetone into a test tube.

  2. Use a glass pipette to introduce a layer of sulfuric acid below the alcohol or acetone. Avoid any mixing of the two liquids, since the demonstration won't work if too much mixing occurs. Do not handle the test tube beyond this point.

  3. Drop a few crystals of potassium permanganate into the test tube.

  4. Turn out the lights. The sulfuric acid and the permanganate react to form manganese heptoxide, which explodes when it comes into contact with the alcohol or acetone. The explosions look somewhat like a thunderstorm in a test tube.

  5. When the demonstration is concluded, inactivate the reaction by using metal tongs to place the test tube into a large container of water. Be very careful! There is a chance the test tube could shatter.

Comments

August 26, 2009 at 7:54 pm
(1) azmanam says:

You can see a write up I did on the Thunderstorm in a Test Tube (and a video of the process) here:

http://www.chemistry-blog.com/2009/02/17/chemistry-lab-demonstrations-upsidedown-thunderstorm/

There was also a nice discussion in the comments.

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