Gummy bear osmosis PDF

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Experiment for course. Includes photos of the experiment I completed and the steps taken....

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JAMIE SAQUILAN 2/8/21 GUMMY BEAR OSMOSIS

Section I: Introduction and Literature Review A. The experiment I chose to do was to examine the effects of osmosis on a gummy bear placed in ordinary water, and a saltwater mixture. I chose this experiment because I completed it about 10 years ago in my mother’s high school biology lab. I called her when I saw this experiment on the list, and after discussing the experiment with her I wanted to try it here at home to see if my results would be different. The results we had 10 years ago in the actual science lab were surprising to me, and I wanted to see if by changing the environment I would be able to get the same or different results. The first source I utilized before beginning my experiment was Sciencing.com. This source describes Osmosis as “occurring when liquids flow through a semipermeable membrane from a diluted to a concentrated environment” (Rogge 2018). It further described why this specific experiment is often used by teachers because of how simple it can be. By simplifying the experiment, the teachers can teach the concept of Osmosis in a way that is easier for students to understand. The second source I used was the Merriam-Webster dictionary which gives the definition of osmosis being “the movement of a solvent (water in this case) through a semipermeable membrane into a solution of higher solute concentration that tends to equalize the concentrations of solute on two sides of the membrane” (Merriam-Webster 2021). Section II: Hypothesis B. My hypothesis is that the gummy bear left in the plain water will grow by absorbing the solution, while the gummy bear left in the saltwater solution will shrink and lose mass because of Osmosis. C.

The Haibro Gummy Bears are made up of gelatin, sugar, and water. Osmosis will cause the solution to pass through a semipermeable membrane, which in this experiment would be the gelatin. Water is allowed into the gummy bear by Osmosis, and the gummy bear sitting in the plain water will absorb the solution and grow to its maximum size. The gummy bear that is in the saltwater solution will shrink due to the salt water solution having more salt molecules than the gummy bear does so the water will move out of the gummy bear into the salt water solution.

Section III: Methods D. The independent variables in my experiment will the plain water, and saltwater solutions. I will be conducting this experiment in our kitchen at room temperature. E. The dependent variables in my experiment are the Haribo Gummy Bears. Before placing the gummy bears into my solutions, the clear gummy bear weighed 2.4g, and the red gummy bear weighted 2.4g. I took photos and will create a chart to show the weights before and after my experiment. I made sure to use two gummy bears that started at the same mass to show how big of a different my experiment would make. The gummy bears sat in the solution for 12 hours total before we attempted to weigh them again. F.

My confounding variable is the amount of water that was used. I used exactly 60ml of water in each cup. By using the exact same amount of water, I will be able to show that the only difference between my independent variables is the salt.

G. Materials used: For this experiment you will need two Haribo Gummy Bears, one clear and one red. I used two solo cups to hold the gummy bears, and labeled which cup was which. You will need a 30ml measuring cup to ensure that both cups will have exactly 60ml of water, and two teaspoons of salt. You will also need a coffee stirrer to stir with, a kitchen scale for accurate measurements, a sharpie for labeling, a timer, and a chart to collect your data with.

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JAMIE SAQUILAN 2/8/21 GUMMY BEAR OSMOSIS H. Begin your experiment by labeling my cups to say which one would be the plain water solution, and which one would be the saltwater solution. Next, use your 30ml measuring cup and fill it with water, and dump into each cup twice. You want to ensure both cups have exactly 60ml for accurate results. In the cup that is labeled saltwater you want to add two teaspoons of salt to the water. Using your coffee stirrer, you will want to stir the water to make sure the salt is dissolved. While the salt is dissolving into the water, you will want to measure the gummy bears using the kitchen scale. Record your data into the chart you created. The first measurement should be recorded into the starting weight column. Place the clear gummy bear into the plain water solution, and the red gummy bear into the saltwater solution. Start your timer for 12 hours. Once the twelve hours are completed, carefully remove the gummy bears from the solution and weigh each one. Record the data into the chart under the ending weight column. Subtract the difference for each gummy bear and record that data into the difference column. Section IV: Result I. The gummy bear left in the saltwater solution for 12 hours shrunk and was not a huge difference but was noticeable. The gummy bear that was left in the plain water grew drastically. By using two gummy bears that initially weighed the same at the beginning of the experiment it was easy to see the difference at the end of the experiment. The beginning weight for both of my gummy bears was 2.4 grams, and after sitting in the solutions for 12 hours both of their masses changed. The gummy bear that was in our plain water solution grew in both size and weight. Once we removed the gummy bear from the water it was very mushy, and we had to be very careful so that it would not fall apart before we could check the ending weight. After absorbing water for 12 hours our gummy bear’s weight went up to 3.7 grams. The difference between the starting weight and ending weight was a whopping 1.3 grams! The saltwater solution gummy bear shrunk in both size and weight. The visual change was not quite as noticeable as the plain water gummy bear, but the physical changes were. The saltwater gummy bear was hard to the touch, and we could feel tiny salt grains embedded into the gummy bear. This gummy bear weight after sitting in the saltwater solution for 12 hours was 1.6 grams. The difference between the starting and ending weight was reduced by 0.8 grams.

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JAMIE SAQUILAN 2/8/21 GUMMY BEAR OSMOSIS J.

Visuals from my experiment:

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JAMIE SAQUILAN 2/8/21 GUMMY BEAR OSMOSIS

Section V: Conclusions K. Our hypothesis stated that the gummy bear left in the plain water would grow and gain mass while the gummy bear in the salt water would shrink. Our hypothesis was proven correct with this experiment. L. An uncontrolled variable in my experiment could have been the water itself. I used tap water which comes from a well so it was not purified completely and may have had other chemicals that could have influenced the experiment. M.

My experiment did prove both of my sources correct in physically showing how osmosis could affect the gelatin gummy bear. Because of the gummy bear’s composition being made of gelatin, water, and sugar it is the perfect semi-permeable membrane to physically show the effects of Osmosis. (Rogge 2018).

Section VI: Sources Rogge, Rebecca. (2018). Osmosis Experiments with Gummy Bears. Retrieved February 5 th, 2021, from https://sciencing.com/osmosis-experiments-gummy-bears-10042742.html Merriam-Webster. (n.d.). Osmosis. In Merriam-Webster.com dictionary. Retrieved February 5, 2021, from https://www.merriam-webster.com/dictionary/osmosis

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JAMIE SAQUILAN 2/8/21 GUMMY BEAR OSMOSIS

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