The Density Bottle is Red, the Density Bottle is Blue...
Tom Kuntzleman | Fri, 05/30/2025 - 10:10
You're going to love this new color variation on the Density Bottle experiment!
solubility
Exploring Color Separation in Salting-Out Experiments
Tom Kuntzleman | Sat, 05/04/2024 - 07:44
Adding dyes to salting out experiments can create a variety of interesting color effects as the dyes differentially dissolve in the aqueous and organic layers. Can this differential solubility of dyes be explained using intermolecular forces as a guide?
Solution to Chemical Mystery #19: Multi-colored Mixture
Tom Kuntzleman | Sun, 02/06/2022 - 13:22
Did you figure out how to create a multi-colored mixture? Check out the solution to Chemical Mystery #19: Multi-colored Mixture!
Thermal Paper as a Polarity and Acidity Detector
Dean Campbell | Thu, 10/28/2021 - 14:09
Thermal paper such as that used for point of sale receipts typically functions by darkening when exposed to heat. The pigment system used in this paper also darkens when exposed to solvents of intermediate polarity and acids. This enables thermal paper to be used as an inexpensive sort of indicator paper for a variety of demonstrations.
How Does the Rainbow Candy Experiment Work?
Tom Kuntzleman | Mon, 02/08/2021 - 07:10
Have you seen the rainbow candy experiment? It's a very simple experiment that involves pouring water into a plate that has M&M's candies or Skittles arranged in a pattern. Very curious shapes of sharply divided regions form spontaneously. How does this happen?!
Solubility and Concentration - A Free Virtual Chemistry Lab Activity
Josh Kenney | Fri, 11/13/2020 - 14:46
In this activity, students learn about solubility and concentration. They watch videos that explain the dissolving process, how to calculate the molarity, supersaturation and how to make rock candy. They also use a PhET simulation to explore factors that affect the concentration of a solution.
The Devil's Milkshake
Tom Kuntzleman | Sat, 10/26/2019 - 19:13
The Devil's Milkshake is a simple, yet interesting chemistry experiment that fits well as a Halloween demo.
Especially JCE: September 2019
Erica Jacobsen | Thu, 09/19/2019 - 19:19
Erica Jacobsen shares highlights from the September 2019 issue of the Journal of Chemical Education of special interest to our ChemEd X community.
Solution to Chemical Mystery #16: A Red, White, and Blue Chemistry Trick for You!
Tom Kuntzleman | Wed, 06/12/2019 - 13:37
The solution to "Chemical Mystery #16: A Red, White, and Blue Chemistry Trick for You!" is presented. How this experiment can be used as a springboard to carry out a simple quantitative analysis of salt solubility is also discussed.
Chemical Mystery #16: A Red, White, and Blue Chemistry Trick for You!
Tom Kuntzleman | Sun, 06/09/2019 - 13:43
Watch this video and see if you can figure out how red, white, and blue colors can all be made from the same chemical solution!