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Naked Egg Lab

Biology
by Sofia Dal on 14 November 2012

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Transcript of Naked Egg Lab

By: Sofia Dal Colletto The Naked Egg Lab How does changing the concentration of corn syrup thus the amount of water, affect the mass of a naken egg? The Question: Design IV: concentration of syrup
DV: percent change in mass (grams)
Control: isotonic egg (50%)
Constant: type of corn syrup, type of egg, type of cup, and amount of solution, time the eggs soaked Hypothesis: If the concentration of corn syrup increases, then the percent of change in mass would decrease because this solution is hypertonic. Materials Procedure: Graph: Calculations and Analysis: Measurements:
Plastic cup: 2.25g
Glove: .1g
Slope Intercept for the Graph:
y=-.409x+11.09 Conclusion: Hypothesis a.) The hypothesis was correct. If the concentration of corn syrup increases, then the percent of change in mass will decrease because this solution is hypertonic.
b.) Since the corn syrup has a hypotonic amount of H2O, and the egg has a hypertonic amount of H2O, the water will move from high to low. The water will leave the egg and the egg will shrink, therefore causing it to weigh less.
c.) When the egg was placed in a high percentage of corn syrup the mass shrunk. For example: Before the experiment, the egg was 75.8g and when it was placed into a solution of 90% corn syrup the change in mass was -14.8. Conclusion: Sources of Error a.) Not all the eggs had the same mass at the beginning of the experiment .
Someone may have forgotten to subtract the mass of the glove or cup from the egg weight.
b.) This source of error could have contributed to innacurate results because the mass of the eggs at the end of the experiment would be too high or too low compared to the rest of the eggs' weight. Conclusion: Redo the Lab a.) I would replace the corn syrup with another substance low in sugar content, and test weather it had a greater effect on the egg's mass or not.
b.) I would select this to retest because then I would be able to test if the egg has a better or worse (if it became more hypo/hypertonic or if it switched to a hypo/hypertonic solution) reaction to the new substance, therefore letting me understand more about the egg and what it is made up of.
c.) If the egg was placed in a solution that had low sugar content, or a hypotonic solution, then the egg will swell because the water will go into the egg through osmosis. 1 plastic cup
1 50mL beaker
corn syrup
distilled water
10 egg
1 plastic plate
gloves
a scale
aprons 1. Soak eggs in solution. Place a plastic plate on the scale and weigh it. Then put the soaked egg on the plastic plate and weigh it. Subtract the weight of the plate from weight of the soaked egg and the plate .
2. Set the egg aside and use the beaker to measure the amounts of distilled water and corn syrup you will use. Then place both the measured corn syrup and distilled water in the plastic cup. Procedure: 3. Place the egg in the plastic cup for two days, then take the egg out of the solution and weight it. If it weighs less than before it was placed in the solution, it is hypertonic, and it has shrunk. If it weighs more, then it is hypotonic, and it has swelled.
4. To test if the egg has boiled or not, place it in a glove. This is to keep from getting egg all over you. Take the glove to the trash can and, in the trash squeeze it. If the egg is soft then it has boiled, but if it feels liquidey it has not. Data Table: Conclusion: Everyday Life a.) The topic we were learning in class that relates to this lab was hypertonic, isotonic, and hypotonic solutions and active and passive transport.
b.) If a solution is hypertonic the concentration of the dissolved substances outside of the cell is higher than the inside of the cell, but if a solution in hypotonic than the concentration of the dissolved substance outside the cell is lower than the inside of the cell. An isotonic solution is when the concentration of the dissolved particles on the outside of the substance is equal to the inside of the substance. Knowing whether a solution is hypertonic, isotonic, or hypotonic is important to understanding the concept, because then you can apply what you know to find out whether the egg and the solution, or any substance for that matter, is hypotonic, hypertonic, or isotonic. When you know what it is you can figure out ahead of time whether the egg will shrink, swell or stay the same. Know what passive and active transport is is also important because then you can narrow down your option to what kind of process is taking place.
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