Notes
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*Package of Skittles candy
*Clear plastic cups
*Various liquid solutions (e.g. water, bleach*, vinegar*, lemon juice, 7-Up, alcohol*, milk, Coke, etc.)
*Journal and pen for taking notes
*Stopwatch or timer
*Camera for taking pictures
*Safety First! Chemicals like bleach, vinegar, and alcohol can cause skin and eye irritation. Make sure there is an adult present, and wear gloves, long sleeves, and protective eyewear.
Methods and Procedures
Print out or draw a chart (like the one above) in your journal to record how long it takes for each Skittle to dissolve in each solution.
Pour ½ cup of each solution into separate plastic cups and label each cup.
Drop a yellow Skittle in each jar and time how long it takes for the color to completely disappear from each one. Write down the time on the chart in the journal.
You should carefully watch the Skittles in the different solutions and see how they dissolve. Take notes on your observations about what happens as the Skittles lose color. You might notice things like:
Does the solution bubble when you drop the Skittles in?
How does the dye dissolve?
Does it fall off in flakes?
Drop down and pool underneath the Skittle?
Does the dye move away as it dissolves or stay around the candy?
Does the dye disappear?
Does the candy change colors as the dye dissolves?
Repeat steps 3 and 4 for the other colors of Skittles candy.
Make a bar graph showing how long each color took to dissolve in each liquid.
Use your charts, graphs, and observational notes to help you describe the results and draw conclusions.
Older students might want to do some averaging to find other interesting results:
What is the average dissolve time for each solution?
What is the average dissolve time for each color?
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