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Date:
Class:
Density Lab
SALT WATER VS. FRESH WATER
Complete the following lab to practice your measuring skills and better understand density.
Problem Does the density of salt water differ
from the density of fresh water?
Hypothesis After calculating the volume and
mass of fresh water and salt water, I
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Information Define the following:
1) Density:
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2) Volume:
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3) Mass:
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Test
Materials
Salt
Water
1 Large beaker
1 Egg
2 different colors of food coloring
2 250mL beakers
Stirring rod
Procedures
Find the mass and volume of each type of
water:
Volume
Mass
Fresh Water
mL
g
Salt Water
mL
g
1. Clear your work space and read all of
the directions.
2. Collect your materials.
3. Create a solution of salt water by
stirring 40 mL of salt into 250 mL of
water in 1 of the 250mL beakers. Add a
few drops of food coloring. Mix well.
4. Gently place the egg in the beaker and
notice that it floats. (If it sinks, add
more salt.) Illustrate what you observe
in data table A (Use colors and labels)
5. Fill the other 250mL beaker with 250
mL regular water. Add a few drops of a
different color.
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Date:
6.
Move the egg from the salt water to
the fresh water and watch it sink.
Illustrate what you observe in data
table B (use colors and labels)
7. Put the egg aside and slowly pour the
salt water into the large beaker. Then
pour the fresh water on top of the salt
water. Tilt the large beaker, with the
salt water already in it, as you pour so
that the salt water and fresh water
don’t mix.
8. Slowly drop the egg into the beaker and
watch as it falls through the layer of
fresh water and stops on top of the salt
water. Illustrate what you observe in
data table C (use colors and labels)
Class:
Data table B
Fresh Water with Egg
Data
Data table C
Data table A
Salt Water with Egg
Salt & Fresh Water Mix with Egg
Name:
Analyze Answer the following questions (in
complete sentences: Using part of the
question in your answer) To help you
better understand what happened in
the lab.
1) In which water did the egg float?
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2) Why would the egg float in this water?
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3) In which water did the egg sink?
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4) Why would the egg sink in this water?
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5) What was different about the two kinds
of water?
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Date:
Class:
Conclusion Answer the following questions
using complete sentences. You will
need to use more than once sentence
and you must give evidence to support
your answer for each question.
1) Does the density of salt water differ
from the density of fresh water?
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2) When looking at the results for data
table C, did the egg float, sink, or do
something else? Why do you think this
happen?
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