Reverse osmosis

normally pass through) with the help of transport proteins. Because facilitated diffusion is a form of passive transport, no energy is required for the movement of a solute from a high solute concentration area to a low solute concentration area. Osmosis is the movement of water molecules from a high water concentration area to a low water concentration area across…

non-tuber fruits (apples). To determine the water potentials, our focus during the lab was to collect data for osmosis rates in different sucrose concentrations. Background Information Now that we have discussed osmosis and free water, we can introduce the idea of water potential to mathematically represent concentration gradients. In cells, we must consider the effect of pressure on osmosis. Plant cells have cell walls that will cause pressure to build up when water diffuses into the cell. Both…

In the homeostasis, osmosis, and diffusion carrot lab, the mean growth in weight for the carrots soaked in solution A, one of our blue solutions, was 0.151 grams. Solution A had a standard deviation of 0.048. For solution B carrots, one of our clear solutions, the mean growth was 0.117 grams. Solution B had a standard deviation of 0.057. For solution C carrots, our other blue solution, the mean growth was negative, actually indicating a loss in weight. This mean loss was -1.426 grams. Solution C…

Cellular Death: Tonicity on Potato Cells Introduction The purpose of this experiment was to test the effects of tonicity on potato cells. During this experiment slices of a potato were placed into beakers containing salt solutions with different concentrations. How will the percentage of salt concentration in solution affect a plant cells water content? This experiment will determine which salt solution concentrate will cause the potato cells to absorb water or lose water. Tonicity in…

solution. In the data table the potato in the fresh water had a starting circumference of 5cm and a starting mass of 4.40g. After sitting the solution the final circumference was 5.5cm and the final mass was 4.68g. The potato gained .5cm and .28g, osmosis caused this to happen because water is pure which means…

Demonstration of the Relationship between the Surface Area to Volume ratio on the rate of Diffusion Introduction: The surface area to volume ratio determines the rate of diffusion, the larger it is the faster nutrients will diffuse. Phenolphthalein acts as an acid-base indicator, turning pink in bases like NaOH and being colorless in acids like HCl. Using agar blocks as cells, a model was made to measure the rate of diffusion of different sized pink agar blocks changing to colorless ones.…

have been dissolved off. This gave us a differentially permeable membrane so that we can observe osmosis and what happens when the membrane is presented with different solutions. Since we did not know the concentration of the egg, we had to assume that it equaled the concentration of the membrane. We then had the ability to determine the concentration based off the assumption and the rate of osmosis. We used 5 different sucrose solutions: 0%, 10%, 20%, 30%, and 40%. One group had an ‘Unknown’…

the dialysis was used for the diffusion and osmosis of iodine, glucose, starch and water. However, starch was unable to pass through the membrane due to it being too large. This is where it does not fully resemble a cell membrane because it can not transform and undergo things such as endocytosis to allow all the molecules to pass through. Conclusion This lab provided a good perspective of the movement of molecules diffusing and going through osmosis into a cell. The ability of the cell…

Hypothesis 2: The number of carrier proteins will increase if the glucose diffusion rate increases, only if number of carrier proteins correlates to facilitated diffusion. Hypothesis 3: The rate of osmosis for the solutions increases, if there is an increase in the MWCO’s and pressure for different solutes. Hypothesis 4: If the MWCO’s increase the pore size, the rate of filtration will increase, but if there is an increase in filtration residue, there…

The cell has several different ways that it allows molecules and ions to cross its membrane, including bulk transport, osmosis, passive transport, and active transport. The purpose of the cell membrane is to protect the cell and only allow specific substances to cross the membrane, such as amino acids or water. Lipids hold the membrane together, along with proteins and carbohydrates. These lipids are saturated or unsaturated, and have a hydrophilic head. The tails hold the membrane together due…