(Your Info) Title Purpose Hypothesis Materials Procedure Results (tables 1-4) Analysis Conclusion

OSMOSIS EGG LAB UNIT 1 ACTIVITY 5

Osmosis Egg Lab Purpose: To observe the process of osmosis occurring through the membrane of an egg. Hypothesis: Vinegar: Syrup: Water:

Observing Osmosis It is difficult to see osmosis in cells because of the small size of the cell. However, there are a few cells that can be seen without the aid of a microscope. In this activity, we will see the process of osmosis in a large cell…

Purpose The purpose of the investigation is to see how cells are affected by various concentrations of solutions.

MATERIALS Raw egg White vinegar (4%) Syrup Water Beaker Graduated cylinder Spoon Saran wrap Rubber bands Paper towels Plastic cup Triple beam balance Measure tape

Procedure Day 1 Take the egg and a piece of paper towel, set it on the triple beam balance and measure the mass. Record this in your mass table. Measure the circumference of the egg with the measure tape. Record this in your circumference table. Record any observations in your observation table before the egg is place in the vinegar. Add 150 mL of vinegar to the cup and place the egg carefully into the vinegar. Observe and record any action. Cover the beaker with saran wrap and secure with a rubber band. Leave it undisturbed for two days.  

Day 2 Observe and record what happened to the egg and record the amount of vinegar left in the beaker once the egg is removed (use graduated cylinder). Rinse the egg with water, pat dry. Set the egg carefully on a piece of paper towel and record the mass (use the triple beam balance). Discard the used vinegar and clean the cup. Measure the circumference of the egg and record your measurement. Add 150 mL of syrup to the beaker and add the egg. Cover the beaker securely with saran wrap and leave undisturbed for one day.

Day 3 Remove the egg from the syrup, keeping the syrup in the cup. Observe and record what happened to the egg and record the amount of syrup left in the cup (use graduated cylinder). Rinse the egg with water and carefully pat dry. Clean the cup. Measure and record the circumference of the egg. Measure and record the mass of the egg sitting on a piece of paper towel. Add 150 mL of water to the beaker and add the egg. Cover the beake3r with saran wrap and leave undisturbed for one day.

Day 4 Observe and record what happened to the egg and record the amount of water left in the beaker (use graduated cylinder). Measure and record the circumference of the egg. Measure and record the mass of the egg sitting on a piece of paper towel. Using the information in your mass, circumference, and volume of liquid tables, create a graph of each of your results.

RESULTS TABLE #1: Observations BEFORE AFTER Egg in vinegar Egg in Syrup Egg in water

TABLE #2 Egg in vinegar Egg in syrup Egg in water Amount of liquid remaining ML

TABLE #3 Before Vinegar After vinegar After syrup After water CM Circumference of Egg Before Vinegar After vinegar After syrup After water CM

TABLE # 4 Before Vinegar After Vinegar After syrup After Water Mass of the egg G

CALCULATIONS SECTION COMPLETE ALL CALCULATIONS HERE

Volume of liquid remaining ML Egg in vinegar Egg in syrup Egg in water

Circumference of egg CM Before vinegar After vinegar After syrup After Water

Mass of Egg grams Before vinegar After vinegar After syrup After water

Analysis Section: What happened to the egg and why? What is the name of the substance that passes through a membrane during osmosis? Did water move into or out of the egg when it was in vinegar? (draw a diagram of molecules moving) Which way did the water move while the egg was in syrup? (draw a diagram of molecules moving) Explain the size change that occurred in the egg from the time it was in syrup until it was removed from water. What did the egg represent?

Conclusion section: What did you prove? Write a brief summary of your results. Did any errors occur? Explain What did you learn?