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Andrew Zhangon 7 October 2012
Transcript of Egg Lab
How can we observe osmosis across a semipermeable membrane? Egg Lab Background info-
When an object with a semipermeable membrane is in a hypertonic solution then it will lose water and shrink. When its in a hypotonic solution than it will gain water and it will swell up. Hypothesis-
If we put an egg in a hypotonic solution, then the egg will swell because there is a higher concentration of water outside the egg and water goes from high to low concentration. If we put an egg in a hypertonic solution, then the egg will shrink because there is a higher concentration of water inside the egg and water moves from a high to low concentration.
List of Materials
-1 chicken egg
-1 cup of 50/50 solution of corn or pancake syrup with water
-1 cup of tap water
-1 cup of vinegar
-1 plastic cup
-1 ft of string or yarn
-A weighing scale Variables
Independent Variables: hypotonic(corn syrup water), and hypertonic solutions(tap water)
Dependent Variables: The circumference of the egg from belly in inches, and weight of egg
Experimental group: The corn syrup and tap water solution
Control group: egg in vinegar solution
Constants: amount of solutions Procedures
Step 1 - Place egg in a cup full of vinegar, leave it there until shell has dissolved.
Step 2 - Take egg out of cup and make observations,measure the circumference of the belly of the egg and weigh it on the scale.
Step 3 - Wash cup
Step 4 - Put egg in cup, label it “corn syrup” and put corn syrup in cup enough to cover the egg.
Step 5 -Take egg out of cup and make observations,measure the circumference of the belly of the egg and weigh it on the scale.
Step 6 - Wash cup
Step 7 - Take experimental egg and put it in the cup and label cup “tap water”.
Step 8 - Put tap water in the “tap water” cup enough to cover the egg.
Step 9 -Take egg out of cup and make observations,measure the circumference of the belly of the egg and weigh it on the scale. Data
Qualitative observations: Egg is squishy, it smells like vinegar.
Quantitative observations: 6in. (circumference of belly) 68.4g (weight)
Day 2: No School!!!
Solution: corn syrup
Qualitative observations: The egg is still squishy, but when the egg is squished it leaves a dent behind. Egg is white, and smooth.
Quantitative observation: 5.75 in. (circumference of the belly) 60.1g (weight of egg)
Solution: tap water
Qualitative observation: It is still squishy but it is not as squishy as the egg in vinegar. It is still white, and is very smooth.
Quantitative observation: 6.75 in. ( circumference of the belly) 73.8g (weight) Control data
Observation: 6.9in. (circumference of belly) 71g( weight)
Day 2: No School!!!
Observations: 6.7in. ( circumference of belly) 70g (weight)
Observations: 6.7in. (circumference of belly) 70g (weight) Conclusion
In the end our hypothesis was correct. Our hypothesis was that if we put an egg in a hypotonic solution (tap water) then the egg will swell up because the water would go into the egg through osmosis. Also, if I put an egg in a hypertonic solution (corn syrup) then the egg will shrink because the water will come out of the egg through osmosis. Our data supports that. The circumference and weight of the egg in the hypertonic solution changed from 68.4g and 6in to 60.1g and 5.75in. When in the hypotonic solution the weight and circumference of the egg changed from 60.1g and 5.75in to 73.8g and 6.75in. The sources of error in our experiment was midway through we had a day off. This made our egg be in a hypertonic solution for an extra day meaning it got smaller. Another error was that we used the same egg for the whole experiment when we should’ve used a different egg each day. (cc) image by nuonsolarteam on Flickr