Chemical Mystery #13: Bye Bye Blue!

This chemical mystery is very easy to perform. Figuring out how this trick is done is also easy...if you know your chemistry!

The solution can be found here.



General Safety

For Laboratory Work: Please refer to the ACS Guidelines for Chemical Laboratory Safety in Secondary Schools (2016).  

For Demonstrations: Please refer to the ACS Division of Chemical Education Safety Guidelines for Chemical Demonstrations.

Other Safety resources

RAMP: Recognize hazards; Assess the risks of hazards; Minimize the risks of hazards; Prepare for emergencies


Join the conversation.

All comments must abide by the ChemEd X Comment Policy, are subject to review, and may be edited. Please allow one business day for your comment to be posted, if it is accepted.

Comments 6

Tom Kuntzleman's picture
Tom Kuntzleman | Fri, 11/23/2018 - 20:09

You are on the right track!

ALFREDO TIFI's picture
ALFREDO TIFI | Fri, 11/30/2018 - 01:55

I would like to check what happens if you simply leave the blue without moving any air over it in more than 10 seconds. I see the borders are white in all the tries. I suspect the white is due to oxygen.

Tom Kuntzleman's picture
Tom Kuntzleman | Fri, 11/30/2018 - 07:23

Great guessing! You are certainly thinking along the right lines by suggesting that something in the air is responsible for the color change. You can find the solution to this mystery here.  In addition, you can see the experiment you suggest - leaving the cleaner exposed to the air for longer periods of time - at this link.

Amiee Modic's picture
Amiee Modic | Mon, 12/03/2018 - 13:35

Great demo Tom. I love stuff you can buy at the grocery store; I'll bet it's fun to shop with you! Great way to spiral density back into the conversation as well.



Tom Kuntzleman's picture
Tom Kuntzleman | Wed, 12/05/2018 - 08:20

Grocery store chemistry is the best! Thank you for pointing out that density can be tied to this demonstration, too; I hadn't thought of that.