How does solute concentration affect the movement of water across a biological membrane?
What is a passive transport? A passive transport is the movement of something across the membrane with no energy. There are 4 main passive transports. There is diffusion, osmosis, Facilitated Diffusion, and Filtration. Diffusion were molecules will spread out evenly into empty space. Osmosis is the movement of water across a membrane. Passive transport happens when you get Pruned Fingers. Cholera is also made by osmosis. Cholera is found in our intestines and it reverses the intestinal cells.
As said in the last paragraph osmosis is the movement of water across the membrane. Well osmosis breaks down into 3 groups itself. Isotonic, is where the concentration
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between the cell and outside of the cell, is the same. When the concentrations are the same there is no movement. Hypertonic, is where there is more water inside the cell than the outside and water moves to the outside. Hypotonic, is where there is more water on the outside of the cell and moves inside the cell. If an egg is placed in syrup then the mass of the egg will go down. If and egg is placed in water then the mass of the egg will go up. Materials 2 decalcified eggs syrup Paper towels marker Weighing container 2 plastic spoons 2 cups balance Distilled water Procedures Step #1: Wear your safety goggles, plastic gloves, and laboratory apron.
Work in pairs. You will eventually share your data with other members of the class.
Step #2:
Obtain two decalcified eggs, provided by your teacher. Gently blot them on a paper towel and determine the mass of each, using correct procedure (use weighting paper or a container on the balance). Record the initial mass of each egg in the spaces provided in Data Tables 1 and 2.
Step #3:
Place one egg in a beaker. Fill this beaker with distilled water to just cover the egg. See Figure 1. Note the appearance of the water at this time and record your observation in Data Table 3. CAUTION: Be careful to avoid breaking glassware.
Step #4:
Place the other egg in a beaker. Pour syrup into the beaker to just cover the egg. Note the appearance of the syrup at this time and record your observation in Data Table 3.
Step #5:
Using the marker, label one plastic spoon water and the other spoon syrup. After 24 hours have elapsed, use the correctly labeled plastic spoon to remove each egg from its beaker. Carefully blot the egg with a paper towel and determine the mass of the egg that was immersed in water. Record in Data Table 2 the mass of the egg that was immersed in
syrup. Step #6: After you have completed the last mass determination of the eggs in water and syrup, record the appearance of the water and syrup in Data Table 3. CAUTION: wash your hands thoroughly after carrying out this lab. Step #7: Determine the percent change in mass of each egg after 24 hours interval by using the following formula: (Mass after immersion – initial mass)X 100 Initial mass Record this percent mass change in Data Table 1 and 2. Step #8: Graph the percent change in mass if each egg versus time using Figure 3. Use a different symbol or color for each egg. Data Table 1: Egg in Distilled Water Mass (grams) % Mass change Initial mass 92.88 0% After 24 hours 103.5 11.4% Data Table 2: Egg in Syrup Mass (grams) % Mass change Initial mass 74 0% After 24 hours 64.35 -13% Data Table 3: Appearances of liquids Initial Final Water Clear and thin Bubbly and yellowish Syrup Thick and dark Thinner and lighter in color Analysis At the end of the project our egg mass in the water increased. It went from 92.88 grams to 103.5 grams. That means that the mass percent change was 11.4%. The egg in the syrups mass decreased. It went from 74 grams to 64.35grams. The percent change in the syrup was -13%. With the data there were some errors that we made that I’m sure a lot of groups made. For example the balances weren’t exact every time. The scales would flicker back and forth from two sometimes even three numbers. Then we had some trouble getting the eggs out of the cups. The spoons weren’t exactly helping getting the eggs out. While we were getting the syrup egg out we drop it back in and made it indented. Conclusion: I had a hypothesis that the egg in the syrup would lose mass. My hypothesis was correct the egg in the syrup lost 13% mass. I had another hypothesis that the egg in the water would gain mass. That hypothesis was also correct the egg in the water gained 11.4% mass. Sites used: https://blog.udemy.com/examples-of-osmosis/
Start with the hot water and first measure the temperature. Record it. 8. Then pour 40 ml into the beaker. You can measure how much water was used by looking at the meniscus.
To start the lab, we got an egg and placed it in different substances to see how the egg would react to the substances. The first day we weighed the egg before putting it in a cup of vinegar, the egg weighed 55.47 grams, we left the egg here for approximately forty-eight hours. The second day, the egg was still in the vinegar. The third day we moved it into the corn syrup where it stayed until the next morning, the egg weighed 76.66 grams.
2. Drop a gummy bear into each of your prepared beaker or cup and place the beaker or cup
The Purpose of this lab is to use the impulse and momentum concepts to explain what happens when the eggs are dropped onto various objects.
This cell membrane plays an important part in Diffusion. Cell membrane and Diffusion Diffusion is the movement of the molecules of gas or liquids from a higher concentrated region to a lower concentration through the partially permeable cell membrane along a concentraion gradient. This explanation is in the diagram shown below: [IMAGE] Turgor When a plant cell is placed in a dilute solution or a less concentrated solution then the water particles pass through the partially permeable membrane and fill the cell up with water. The cell then becomes Turgor or hard. An example of this is a strong well-watered plant.
If the concentration of one side of the membrane is greater than the molecules will travel from the higher to lower concentration. Eventually there will be a dynamic equilibrium and there will be no net movement of molecules from one side to the other. Osmosis is the diffusion of water. Like diffusion, the water moves from a region of higher water potential to a region of lower water potential.
The egg appeared shriveled after removing it from the sucrose because of the movement of water out of the egg. The sucrose solution was hypertonic so water moved out of the egg from an area where water was more concentrated to the outside of the egg where water was less concentrated due to the high amount of sugar or solute. The acetic acid in vinegar did remove the shell from the egg, because the egg required two days to completely remove the shell, some water did move into the egg causing its initial mass without the shell to be higher than the egg's mass with its shell. Whenever the egg was transferred from the sucrose to the distilled water, the concentration of water outside the shriveled egg was greater than the water concentration inside the egg; therefore, water moved into the egg until equilibrium was reached. At that point, movement into and out of the egg continued with no net movement of water
The Functions of Osmosis Osmosis is the passive transport of water through a selectively permeable membrane, a membrane that allows certain needed particles to pass through it more easily than others. Pores in this type of membrane are large enough for water to pass effortlessly through it. The flow of water during osmosis depends on the concentration of a solute either within a cell membrane or surrounding the membrane. Water naturally flows from a hypertonic solution, an area of high concentration of solute, to a hypotonic district, a solution containing a lower concentration of solute.
In diffusion, particles move from an area of high concentration to an area of low concentration until they reach equilibrium. The direction of diffusion is called the concentration gradient. An example of diffusion would be if a person sprayed air freshener in a room. The particles would move from the area of high concentration to the rest of the room, so after a few minutes, people can smell it from the other side of the room. Osmosis is the diffusion of water across a semipermeable membrane; the molecules move from an area of high water concentration to an area of low water concentration until they reach equilibrium. Water flows in the direction to dilute. For example, a person’s cells have more salt than a poot -- it has a higher concentration of solutes. Water from the pool will flow into the body faster than the water from the cells comes out, so the cell will swell up. Both diffusion and osmosis do not require no
Osmosis Investigation What is Osmosis? Osmosis is basically the movement of water molecules from a dilute system solution to a concentrated solution, through a partially permeable membrane. Water molecules are able to pass through the cell membrane because they diffuse whereas sugar molecules are larger and cannot diffuse as easily therefore not being able to pass through. Cell membranes are like visking tubes because they will let some substances through but not others. They are partially permeable membranes.
Osmosis is the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration. Osmosis is used to transfer water between different parts of plants. Osmosis is vitally important to plants. Plants gain...
...ach egg. We put the eggs in each jar (one per jar) and filled them up till they were covered in vinegar (they will float but push the eggs down gently to see if you have enough vinegar. Add a little more if you don’t have enough). Immediately the eggs had tiny little bubbles everywhere around them. The chemicals and science got to work right away at dissolving the egg shell around each egg. It was amazing! I just want to add that at times the eggs would like to “dance”. By that I mean that the eggs would like to randomly start spinning and I have no clue why. I’ve tried researching this but nothing ever came up I thought it was very fascinating and humorous to watch though. We started this experiment April 1st 2014 at 11:36 am and we ended the April 4th 2014 experiment on at 2:58 pm. It did not bounce as high as we had hoped but the experiment still did a great job.
Most cell membranes are like that, being permeable to water and some solutes only. Osmosis is therefore the diffusion of water through a partially permeable membrane. The basic principles of diffusion apply here.
2. In the large beaker, put water and boil it completely. After that, remove the beaker from heat. 3. Sample tubes (A-D) should be labeled and capped tightly.
== § Test tubes X 11 § 0.10 molar dm -3 Copper (II) Sulphate solution § distilled water § egg albumen from 3 eggs. § Syringe X 12 § colorimeter § tripod § 100ml beaker § Bunsen burner § test tube holder § safety glasses § gloves § test tube pen § test tube method = == = =