# Osmosis Gummy Bear Lab

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3/7/2012
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```							                                                             Name, Period
Lab: Osmosis (Diffusion of Water) with Gummy Bears

Purpose: To investigate the movement
of water into and out of a polymer
(gelatin).

Background Information: Gummy
Bears are made of gelatin and sugar.
Gelatin is a polymer that forms large 3-
D matrices which give structural
support to jellies, jams, and other items.

Hypothesis: (leave blank space)

Materials: 2 cups, permanent marker,
2 gummy bears (different colors), tap
water, saturated salt solution, corn
syrup, ruler.

Procedure:
1. In a group of 4 people, obtain 2
cups, 2 gummy bears, and a ruler.
2. Write everyone’s initials and class
period on 2 pieces of tape. Affix tape
to cups.
3. Using tape, label 1 cup “Tap Water”
and 1 cup “Corn Syrup”.
4. Measure your bears (in cm) for
length, width, and height. Record this
5. Place bears in cups and cover with
the appropriate solution (tap water or
corn syrup).
6. Let sit overnight.
7. On the next day, carefully pour liquid
out and catch the bear on a paper
towel. Rinse corn syrup cup at the
sink.
8. Measure length, width and height
9. Put bears back in appropriate cups.
Cover bears with saturated salt
solution.
10. Let sit overnight.
11. Repeat steps 7 and 8, recording
final data on data table.
12. Calculate volume of each bear in
the last column (l x w x h).
Data (in centimeters):
Tap Water
Length Width Height     Volume
Before water
After water
After salt
water

Corn Syrup
Length   Width Height   Volume
Before corn
syrup
After corn
syrup
After salt
water

Observations:
Day 1:

Day 2:

Final:
Name ____________________Per_____

Osmosis in Gummy Bears
Lab Write-Up
be written in complete sentences.)

1. What happened to the bears
when placed in tap water? Why?
2. What happened to the bears
when placed in corn syrup? Why?

3. What happened to the “tap water
bear” when placed into the salt
solution? Why?

4. What happened to the “corn
syrup bear” when placed into the salt
solution? Why?
5. Determine whether the salt
solution would be considered
hypertonic or hypotonic in each
situation.

6. After calculating the volumes of
the bears in your data table, construct
a line graph showing the volume
changes for each bear. See the
teacher demonstration for help. Use
the back of this paper to make your
graph.

```
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