Osmosis To simulate and observe the diffusion of solutes and the osmosis of water through a semipermeable membrane through color change and sugar tests. To speculate osmosis occurring In dialysis bags and potato cores by comparing percentage change in masses.
How to Write a Summary of an Article? Osmosis is the diffusion of water from an area of low concentration to an area of high concentration across a semi-permeable membrane. The purpose of this lab is to compare the three different types of solutions affect on the relative size of the vacuole to the cell, the outer membrane of onion red cells tunics are used to figure out the different types.
In the red onion you can see effects promptly when the onion cells are placed in different type of solutions. If a saline solution is added to the outer membrane of a red onion cell, then based on the amount of the solution, it will cause the vacuole inside the cell to become hypertonic thus shrinking in size.
This is because water moves from inside the vacuole, to the cell since the saline solution is entering the vacuole. While if deionized water is added on to cell, then the vacuole size should get larger or stay the same.
Red onion without any solution added to it. Constant temperature — this will be insured by keeping the room at a constant temperature of 21 degrees, because if temperature is not kept constant, the data might be affected.
Type of onion — this will be insured by using the same onion red onion to collect data, if a different type of onion is used, this might cause the data to be inaccurate.
Microscope — while collecting data, and observing what happens to the red onion, the same microscope shall be used for observing what happens to the vacuoles.
Take a small piece of onion and peel off a sheet of the purple skin. Cut a piece of skin about the size of a little fingernail. Place the piece onto a microscope slide, and put it under the microscope to record data as this is the control group. Then add five drops of deionized water onto the slide, then record qualitative and quantitative observations on the size of the vacuole inside the cell.
Then repeat step one, and put the piece of skin on another microscope slide. Record qualitative and quantitative observations again on the change in size of the onion cell vacuole. Steps 2, 3, 5, and 6 were all recorded under high-power objective in the microscope.
Clean and dry slide and coverslip.
Vacuoles shrank a lot, and are visibly hypertonic Data Analysis: The independent variables in the experiment were the: The type of onion used in this experiment was a red onion, and the purple outer membrane was used to record data.
The control group that the experiment was based upon was a slice of the outer membrane without any solutions added to it. The dependent variable was the amount of water inside the vacuole that changed based on the addition of the saline solutions, and the deionized water.
The controlled variables in the experiment were: The constant temperature would be insured by keeping the room at a constant temperature of 21 degrees room temp.
The type of onion will be insured by using the same onion red onion to collect data, if a different type of onion is used, this would increase chance of error while collecting data.ADVERTISEMENTS: In this essay we will discuss about: 1.
Definition of Osmosis 2. Types of Osmosis 3. Osmotic Pressure 4. Factors 5. Importance 6. Osmotic Relations of Plant Cells. Contents: Essay on the Definition of Osmosis Essay on the Types of Osmosis Essay on the Osmotic Pressure (O.P.) Essay on the Factors of Osmosis Essay [ ].
The basic principles of Osmosis and Diffusion were tested and examined in this lab.
We examined the percent increase of mass and molarity of different concentrations of sucrose in the dialysis bag emerged in distilled water and the potato cores emerged in concentrations of sucrose.
Diffusion & Osmosis with Data Analysis. Source Institutions. National Health Museum.
Add to list Go to activity. This three-part lab helps learners understand the essential principles governing diffusion and osmosis. Dialysis tubing is used to simulate an animal cell and actual plant cells are used to illustrate the process of osmosis in plants. Osmosis, a specific kind of diffusion with respect to water takes place in the cells.
This kind of diffusion is where water moves through a selectively permeable membrane, that Is, a membrane that only allows specific molecules to pass through. Osmosis and Diffusion Lab Essay Sample The purpose of this lab was to observe the rate of osmosis and diffusion, as well as the effect of molecular size of the particles on this rate.
Part I of the lab was a demonstration of osmosis and diffusion, that dealt with raisins in different liquid environments, each with a different concentration of.
Lab Report: Diffusion and Osmosis. Print Reference this. Disclaimer: Calculation of Water Potential from Experimental Data Analysis: Part A: Diffusion and Osmosis. This lab was to understand how diffusion and osmosis worked.
The data that was received was consistent at some times. For part A and D of the lab, the results and.