Problem: How does soap, alcohol, and temperature differences
affect the dissolution speed of water?
Materials: Food coloring, watch, water, eyedroppers, warm water,
rubbing alcohol, dish soap, ice cubes, plastic cups, small plastic bags
1.You will work in-groups of three. You will need a clear plastic
cup of warm water and an eyedropper holding some food coloring
(red or blue). Also get some ethyl alcohol and dish soap.
2. Place a drop of food coloring in a cup of water. Record how
many seconds it takes to completely dissolve in the water?
3. Place one or two ice cubes in the cup of water. Place a drop
of food coloring on an ice cube. What happened?
4. Place a drop of food coloring in the cold water. How many
seconds did it take for the food coloring to completely dissolve
in the cold water?
5. Place a drop of food coloring in a cup of water. Add a few
drops of alcohol. How does the alcohol affect the solution?
6. Add a drop of food coloring to a cup of warm water. How many
seconds does it take for the coloring to dissolve completely in
the warm water?
7. Add another drop of food coloring to the water. Then add a
few drops of dish soap to the water. What happened?
8. When you are completely finished you should make a bar graph
representing the solutions versus time of dissolving.
Note: You should develop a data table for this lab. You
should fold the paper in half vertically and in thirds horizontal,
as shown to the right.
For steps 2 through 7 you should draw a picture of what happens
and record the respective times in each box. Make sure to label
which step is represented by each box (#'s 2-7).
Your data table should resemble the figure
1. What is diffusion?
2. What is osmosis?
3. What is Active Transport?
4. What is Respiration?
5. What is Fermentation?
by: The Online Teacher Resource (www.teach-nology.com)
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