C683 - Gummy bear osmosis lab PDF

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Gummy bear osmosis lab...

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Kelsey Davis WGU C683 Gummy Bear Osmosis Lab My experiment will be testing osmosis with gummy bears. Dictionary.com defines osmosis as “the tendency of a fluid, usually water, to pass through a semipermeable membrane into a solution where the solvent concentration is higher, thus equalizing the concentrations of materials on either side of the membrane” (Osmosis, 2020). This means that the semipermeable membrane, in this case the gummy bear, will allow the contents it is surrounded in to penetrate and enter into the gummy. However, the semipermeable membrane doesn’t allow everything to pass through its membrane. “Scientists explain this by using the terms hypertonic and hypotonic: hypertonic solutions have higher concentrations of solutes – solids dissolved in liquids – while hypotonic ones have a comparatively lower concentration.” (Rogge, 2018). In my experiment, I will be testing to see if water or a salt water solution will expand the size of the of the gummy bear through osmosis. In this experiment, I will be using Haribo Gummy Bears, water and salt water. B. The gummy bear left in the plain water will absorb the solution and expand its weight more than the gummy bear left in salt water. The gummy bear left in the salt water solution will shrink in weight due to osmosis. C. The gummy bear is made of gelatin, sugar and water. Osmosis causes the solution to pass through a semipermeable membrane, which in this case is the gelatin or gummy bear. Osmosis allows the water that the gummy bear is sitting in to be absorbed to reach its max size. The gummy bear that is in just water will enlarge due to the absorption of the water. However, the gummy bear that is in the salt water solution will get smaller due the salt water solution having more salt molecules than the gummy bear, so the water will move from the gummy bear to the salt water solution. D. The independent variables I will be using in my experiment are the salt water solution and plain tap water. The experiment is conducted on the kitchen counter overnight. E. The dependent variable I will be using in my experiment are Haribo Gummy Bears. These gummy bears measure at ____ before placed into the independent variables. I will create a chart to show the measurements before and after the gummy bears have been soaking in the solutions for 12 hours. F. The confounding variable is the amount of water used. I will used exactly 60 ml of water for both the salt water solution and the plain water. Using the exact same amount of water will show that the only difference in the two independent variables is whether it has the salt with the water or not.

G. You will need: two Haribo Gummy bears. Two __ml plastic cups. One 30ml measuring cup. A popsicle stick or small spoon to stir with. A teaspoon for measuring sugar. Two teaspoons of salt. A kitchen scale. A sharpie. A timer. 120 ml of water. And a chart to collect data. H. Set the two __ ml plastic cups out. With the sharpie label one water and the other salt. Using the 30 ml measuring cup, fill up with water and poor into each of the plastic cups twice. This should total 60 ml of water in each plastic cup. In the cup that is labeled ‘salt’, using the measuring teaspoon, measure two teaspoons of salt and add it to the water. Mix using the popsicle stick or stirring spoon you have on hand. Once salt is dissolved, set cups to the side. Grab the scale and weigh each of the gummy bears in grams. Using the data chart, fill in the ‘start’ column the weights. Place one gummy bear in each of the two plastic cups with solutions. Set your timer for 12 hours. After twelve hours remove the gummy bears from the solution and weigh. Record on the data chart in the ‘after’ column. Subtract the difference and record that in the ‘difference’ column. I. The gummy bears left in the plain water enlarged, while the gummy bears in the salt water solution shrunk. After weighing both gummy bears at the beginning of the experiment and seeing how they weighed exactly the same helped with more accurate results. The start weight for both was 2.3 grams. After sitting in the solutions for 12 hours, they both changed. The gummy bear in just the water grew in size and weight. After removing the gummy bear, the feel was very mushy and softer than originally. The water made it more permeable and easier to fall apart. The gummy bears weight after the twelve hours went up to 3.5 grams. That is a difference of 1.2 grams. The gummy bear in the salt water solution shrunk in size and weight. The size wasn’t as noticeable as the enlarged one, however you can still see a difference. After removing the gummy bear from the salt water solution, the gummy bear was hard to the touch and could feel salt grains on the gummy bear. The gummy bears weight after twelve hours went down to 1.7 grams, losing .6 grams.

J. Water Salt Water Solution

Data Chart Start 2.3 grams 2.3 grams

After 3.5 grams 1.7 grams

Difference +1.2 grans - .6 grams

K. Our hypotheses: The gummy bear left in the plain water will absorb the solution and expand its weight more than the gummy bear left in salt water. The gummy bear left in the salt water solution will shrink its weight due to osmosis.

Both hypotheses were both confirmed. Looking at the chart above and the summaries in section ‘I’, the hypotheses are clearly supported in weight and size. L. The uncontrolled confounding variable is the gummy bear colors. Each gummy bear was chosen at random, and each gummy bear was a different color. The amount of food coloring mixed in to create these colors of gummy bears isn’t a constant and could, in turn, affect the amount of water that can be absorbed into the gummy bear. M. These results relate to the references used in the literature review because this experiment does, in fact, show osmosis. The literature review also explains why the salt solution doesn’t penetrate the gummy bear and causes it to shrink instead of grow.

References Osmosis | Definition of Osmosis at Dictionary.com. (n.d.). Www.Dictionary.Com. Retrieved July 17, 2020, from https://www.dictionary.com/browse/osmosis?s=t Rogge, R. (2018, March 13). Osmosis Experiments With Gummy Bears | Sciencing. Sciencing. https://sciencing.com/osmosis-experiments-gummy-bears-10042742.html...