Diffusion And Osmosis Lab Report

The main purpose of the experiment was to test the idea that water would move from the higher concentration to the lower concentration. In order to test this theory, we placed potato slices in 7 different containers, each containing different concentrations of NaCl, to measure the weight change from osmosis. The containers ranged from 0M NaCl all the way to .6M NaCl. We measured the potato slices before and after placing the slices in the solutions and recorded the net change in weight to determine the tonicity of the potato cells. Our results showed that the potato slices put in a NaCl solution of .2M or higher lost weight and the potato slices put in a NaCl solution of .1M or lower gained weight. This shows that the osmolarity of the potato falls within the range of .1M to .2M, and it also proves the process of Osmosis by having the higher concentration move to the lower concentration. In addition to this, it can be concluded that the osmolarity of cells can be determined by observing the affects of osmosis.

11. The experiment was repeated three more times using different water temperatures (room temp water, cold temp water, hot temp water).

1. The relationship between rate of diffusion/ osmosis, volume, and surface area can be easily seen and analyzed through the data that was collected from procedure one: Surface Area and Cell Size. Phenolphthalein is a dye-material in this lab that was used to determine whether a substance was an acid or base. This could be told as the phenolphthalein changed into a murky. Muddled and clouded color when mixed with acids. When the chemical aid was mixed in with a base, the color

The hypothesis states that if the solution is hypotonic the results will decrease, if the solution is hypertonic the results will increase and if the solution is isotonic the solution will vary and or remain constant. In order to test the predictions of the hypotonic, hypertonic, and isotonic hypothesis for the solution  made during the study,  four samples of sucrose were taken and placed into two different beakers each containing a different concentration. Then dialysis tubing A was placed into beaker 1 with B, C, and D placed into beaker 2 for 45 minutes and weighted at 15 minute intervals. My finding in the study was that each of the four samples changed from their initial weight and for the most part accurately proved the hypothesis.

As we know that osmosis means diffusion or dispersion of water through a selectively permeable membranes from high concentration to a lower concentration and there are many different factors that can affect the rate of Osmosis such as temperature particle size and the size of concentration ingredient. As we know that higher temperature can cause osmosis to occur at much faster rate because a molecule are more likely to pass through the selectively permeable membrane quicker than they would at a lower temperature. In this experiment the sucrose molecule was too large to pass through the dialysis bag, while water molecule able to move freely in and out due to their small size. Lastly the congregation gradient can greatly affect the rate of osmosis

Osmosis is defined as the tendency of water to flow through a semipermeable membrane to the side with a lower solute concentration. Water potential can be explained by solutes in a solution. The more positive a number is more likely it will lose water. Therefore should water potential be negative the cell the less likely it will lose water. In using potatoes the effects of the molarity of sucrose on the turgidity of plant cells. According to Clemson University, the average molarity of a White potato is between .24 M and .31 M when submerged in a sorbitol solution. This experiment was conducted with the purpose of explaining the relationship found between the mass in plants when put into varying concentrations of sucrose solutions. Should the potatoes be placed in a solution that contains 0.2M or .4M of sucrose solution it will be hypotonic and gain mass or if placed in .6M< it will be hypertonic and lose mass instead. Controlled Variables in this lab were: Composition of plastic cups, Brand of Russet Potatoes, Brand of Sweet Potatoes and the Temperature of the room. For independent variable that caused the results recorded it was the different Sucrose concentrations (0.0M, 0.2M, 0.4M, 0.6M, 0.8M, 1M). The dependent variable was the percentage change from the initial weighs to the final. The cup with .4 molarity was the closest to an isotonic solution and was used as the control group for the lab. Water potential is the free energy per mole of water. It is

A cell needs to perform diffusion in order to survive. Substances, including water, ions, and molecules that are required for cellular activities, can enter and leave cells by a passive process such as diffusion. Diffusion is random movement of molecules in a net direction from a region of higher concentration to a region of lower concentration order to reach equilibrium. Diffusion does not require any energy input. Diffusion is needed for basic cell functions - for example, in humans, cells obtain oxygen via diffusion from the alveoli of the lungs into the blood and in plants water

In this experiment, I wanted to find out if vinegar, water, dyed water, and/or salt water can go through the membrane of a chicken egg. Before starting my experiment, I read that the cell membrane controls what goes in and out of the cell and found I also learned that small enough molecules can go in and out of the cell through the process of diffusion. In addition I learned that the two different types of diffusion, passive and active transport, determine whether the process of diffusion is going to use energy or not.

This report presents the behavior of water molecules across a membrane and the membranes when they are put into different solutions of different concentrations. The plamolysis of onion skin was tested under water, 0.3M sucrose, and 2.0M sucrose. The water was hypotonic to the onion cells causing the cells to become larger and less pigmented. The sucrose was hypertonic to the cells leading to osmosis and the cells to become shriveled and more pigmented as the color was left in the cells. Observed from the experiment, the higher the concentration of the sucrose the smaller the cells became.

If someone was to drown in salt water their would be a dramatic change in the shape of the blood cells found in the body, exspecially when compared to a victim that drowns in fresh water. This is all tied in to the process of osmosis, or the diffusion of water through a selectively permeable membrane. Water moves through the membrane until equilibrium is reached. Initially, the more concentrated solution results in a increase of volume and pressure. Their are three types; isotonic, hypertonic, and hypotonic.

In this lab, we performed two experiments to understand the process of osmosis and its relationship with solute concentration, and how water potential is affected by temperature. In the first part of our lab (there was no hypothesis for this experiment), where we used dialysis tubing to model osmosis and its relationship to solute concentrations, we observed how the percent change in mass increased as the solute concentration of the solution did. The percent change in mass was positive, meaning that the dialysis tubing had gained mass after being submerged in the distilled water solution. This means that the dialysis tubing gained water, which was the result of osmosis. The water diffused from outside the tubing, through the semipermeable membrane, into the tubing in all of the cases. Because we know that water diffuses from high water concentration to low water concentration, we know that the sucrose solutions in the dialysis tubing had less water concentration than the distilled water surrounding the tubing. Furthermore, the molarity of the sucrose solutions inside the tubing increased from 0.2M to 1.0M, which means that the sucrose (solute) concentration was increasing, so the water concentration was decreasing. This explains why the percent change in mass increased as the molarity increased; more water was flowing into the tubing as the water concentration got lower and solute concentration got higher. In other words, the water was flowing from a hypotonic solution to a

Osmosis is a special type of diffusion. It is the diffusion of water across a semipermeable membrane which is a membrane that is freely permeable to water but is not freely permeable to solutes, the water moves from a dilute solution to a more concentrated solution (Karp, 2010). Both diffusion and osmosis are passive transport, energy is not used in the transport. In osmosis water moves across a membrane toward the solution of greater concentration, because the concentration of water is lower there (Martini and Bartholomew., 2007).

The process that is occurring that we would see is osmosis is a special type of diffusion which is when the molecules are moving from a high concentration of water to a low concentration of water to have a water balance. The first thing we did was put a piece of onion on a slide with tap water and then under a microscope and analysis how the cell looks which was clear to see the cell wall as well as the cell membrane and the cytoplasm. Then, we added the salt water solution on the onion and put it under the microscope and let it sit for a few. By adding salt water it would make the water move out of the cell because the surrounding area is hypertonic. After a few we check back with the onion and noticed that the cell was shrinking and the cell membrane was becoming a curve and cytoplasm began to shrink, therefore, we conclude that if a cell is placed in solution with different concentration it would either shrink or swell it's all depending on the place where there is a low concentration that the water can move

The process by which water moves through membranes by a special kind of diffusion is called osmosis. Like solutes, water moves down its concentration gradient. Water moves from areas of high potential to low potential. The high potential contains low solute concentrations, while the low potential contains high solute concentrations. In surrounded cells, osmosis is affected not only by the solute concentration, but also by the defiance to water flow by the cell wall, known as turgor pressure.

Potatoes are vegetables that are grown under the surface of the dirt. Potatoes are commonly cooked for consumption. Some common foods that are made from potatoes are; mashed potatoes, french fries, and some kinds of chips. Potatoes are grown in one-hundred twenty five countries. If eaten raw, potatoes can cause sickness as they may be poisonous. Potatoes are made