University:
College of Central Florida
Course:
BSC2010 | Integrated Principles of Biology I
Academic year:

2023
Views:

192

Pages:

3
Author:

sonalhava9qv

Osmosis Lab Background information Osmosis is the process whereby water moves across a cell membrane by diffusion. Diffusion takes place when the molecules of a substance tend to move from areas of higher concentration to areas of lower concentration. The process of osmosis must be tightly controlled by cells, otherwise they will die. For example, if you place a red blood cell in pure (distilled) water, it will quickly take up water until it bursts. That is why plasma, the liquid portion of our blood is made of water with proteins and salts dissolved in it, preventing the unnecessary gain of water by our blood cells. In plants, osmosis is just as important. Plants with too little water will wilt. This happens when water moves out of the cells by osmosis. Without this water there is little pressure inside the cells and the plant can no longer support itself against the pull of gravity. However, after watering the plant, the cells become reinflated with water and the plant stands upright. The effect of water loss on plant cells is shown in the diagram below. Purpose: In this lab activity you will observe the effects of osmosis on plant cells. You will use the weight of pieces of potato to see how much water moves in and out of cells in different salt solutions. Hypothesis: If the potato is put in H2O then I feel like the potato will increase in size. Materials ● Salt Water ● Potato ● 3 containers ● Scale Procedure: 1. Prepare salt water solution by adding 30 ml of salt to 70 ml of water 2. Pour salt water in bowl or beaker, regular tap water in another, and distilled water in another 3. Collect 3 potato samples 4. Weigh each potato sample 5. Record on data table 6. Trace the potato sample on your data table 7. Place one slice in salt water solution and the other slice in the regular water 8. Leave for 30 min 9. Trace samples and record data 10. Weigh samples and record data Pre lab Questions 1. What do you think will happen to the potato in the salt solution? Why? The potato in the salt water will probably just sink because of how much it weighs. 2. What do you think will happen to the potato in the water? Why? I believe the potato in the water will increase in size because it might absorb the water and make it bigger. 3. Explain how osmosis is related to homeostasis? They both balance each other out. Data and Observations Potato Initial (before) weight (g) Final (after) weight (g) A (salt solution) 5.8 5.1 B (water) 4.3 4.6 C (distilled water) 5.8 6.1 Drawing Post Lab Questions 1.What happened to the potato that was in the salt solution? Why did that happen? The potato in the salt solution will decrease in weight because it let out little pieces of potato.. 2. What happened to the potato that was in the regular tap water? Why did that happen? The potato grew in weight from 4.3 to 4.6. 3. What happened to the potato that was in the distilled water? Why did that happen? The potatoes weight also grew by a little; it went from 5.8 to 6.1. 3. Try putting the potato back together as one. Do they fit perfectly as the did before? Why or why not? No they didn't because they were cut into weird pieces somewhere also more slippery than the others.

Osmosis Potato Lab

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