lab diffusion and osmosis

lab diffusion and osmosis - Akshay Patel Period 1 The...

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4/2/11 Period 1 The Effect of Diffusion and Osmosis on Molecular Movement Abstract The objective was to see diffusion occurs with different sized molecules in dialysis tubing in part 1 of the lab. After reading the procedure and background information, inferences can be made such as if a dialysis bag is filled with glucose and starch is placed in a beaker for 30 minutes, then some of the glucose will go to the beaker with distilled water. In this part, a solution of glucose and starch will be positioned inside a bag of dialysis tubing and the tubing is going to be placed in a beaker of water so diffusion can occur for 30 minutes. Glucose, water, and the IKI solution were able to go through the membrane of the dialysis tubing while the sucrose was too big to go through. The hypothesis is supported by the results since glucose was able to go through the membrane. The objective was to see osmosis occurring with dialysis bag containing sucrose for part 2 of the lab. From reading the procedure and background information, inferences can be made such as If the concentration of the solution increases in the dialysis bag, then the mass of the bag will be greater after 15 minutes in the distilled water. Sucrose will be placed in a dialysis bag and the dialysis bag will be placed in water for 15 minutes to have osmosis occur. As the concentration of the sucrose solution increases, more water will enters which is confirmed with the results with the increase percent change of mass. These results confirm the hypothesis made since mass did get greater. The objective was to find the molar concentration of a potato chunk cell for part 3 of the lab. From reading the procedure and background information, it can be inferred that if the concentration of the solution increases, then the change of mass of the potato will decrease. In this part, a potato chuck will be in a solution and the mass of it will be taken before and after it is placed in the solution. It will be in the solution overnight. With the percent change of mass of different concentration, the molar concentration can be found of the potato. When the concentration of the sucrose was greater than the molar concentration of the potato, then it will have a negative change in mass and when the concentration of the sucrose was less than the molar concentration of the potato, then it will have a positive change in mass. This will help to find the molar concentration of the potato. These results support the hypothesis since as the concentration increases, the percent change in mass decreases. The objective is to see the effect of fresh water and a salt solution to an elodea leaf for part 4 of the lab. By the background information, it can be inferred that if a hypertonic solution such as a salt solution is added to plant cell, then plasmolysis will occur. Data will be collected by observations through drawings. Plasmolysis does occur when the salt solution is added and the fresh water brings the plant cell back to normal. This supports the hypothesis that was made.
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lab diffusion and osmosis - Akshay Patel Period 1 The...

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