Lab Report Osmosis Bag

The bags were put in their corresponding beakers, all of which contained tap water, except beaker #5 (tap water bag #5 was placed in beaker #5 which instead of holding water, was filled with 40% sucrose) concurrently, recording the time. In the same manner in which the bags were placed in the beakers simultaneously, remove the bags every 10 minutes, and record the weight of each bag. This process should be repeated for at least 90 minutes total.

Bag 1 was 10 mL and filled with dH2O and submerged in dH2O, resulting in being isotonic solution. Bag 2 was 10mL and filled with 20% sucrose, which was submerged in dH2O, resulting in a hypertonic solution. Bag 3 was 10mL and filled with 40% sucrose and was then submerged in dH2O, resulting in a hypertonic solution. In the sac containing no sucrose, just dH2O, there was no net movement; it maintained its initial mass of 16g throughout the 45 minute experiment, meaning it had 0% mass change (see Table 1). Bag 2 was the sac containing 20% sucrose and its mass was increased throughout the experiment and its final total mass change percentage was 7% (see Table 1). The sac containing 40% sucrose had the greatest mass change over the forty-five minute time period (see Table 1). The results in Table 1, coincide with the Graph 1. The sac filled with 0% sucrose had no mass change, therefore has 0 as its rate of osmosis (Graph 1). The sac with 20% sucrose had a rate of osmosis of 0.027g/min, making it the second biggest rate of osmosis. The sac containing the 40% sucrose had the largest rate of osmosis, being 0.098g/min (Graph 1). A table was added to fully understand rate of osmosis (refer back to Graph

The dialysis bag experiment resulted with beaker one having relatively similar numbers, showing as an isotonic medium. Beaker two’s solution gradually increased within an hour which caused the product to

Table 1 shows the contents of the bags and the content of the concentration it was submersed in. Bags 2-4 each contain a solution of both sucrose and water. These bags were each put into beakers containing hypertonic solution. These bags gained weight over time because the water moved from its high concentration inside the beaker to the low concentration inside the membrane of the artificial cell, the membrane being the bags that consisted of dialysis tubing. The

In this experiment, we will investigate the effect of solute concentration on osmosis. A semi‐permeable membrane (dialysis tubing) and sucrose will create an osmotic environment similar to that of a cell. Using different concentrations of sucrose (which is unable to cross the membrane) will allow us to examine the net movement of water across the membrane.

Osmosis is a special type of diffusion. It is the diffusion of water molecules across a semipermeable membrane (a membrane that allows for the diffusion of certain solutes and water) from an area of higher water concentration to one of lower water concentration. For example, if a 1 M aqueous starch solution is separated from a .5 M aqueous starch solution by a semi-permeable membrane, then water molecules will move from the .5 M aqueous starch solution (higher water molecule concentration) toward the more concentrated 1M starch solution (lower water molecule concentration) until an equilibrium of water molecules exists between the two solutions. Since the semi-permeable membrane did not allow for the passage of starch molecules, the 1M-starch solution will gain in volume as the water moves in (Figure 3).

I believe the gummy bear in glass #1 that has just water will swell because the concentration of solutes is higher within the gummy bear. This solution will be hypotonic. In contrast, the gummy bear in glass #2 with the water and salt solution will shrink because the concentration of solutes is higher outside of the cell. This solution will be hypertonic. Lastly, the gummy bear in the glass #3 without water or salt will stay the same because the concentration is equal.

2. A hypertonic solution will cause the cell to shrink because more particles are in the solution and not in the cell.

All proprieties of matter contain molecules that are either solids, liquids, or gases and carry factors of kinetic energy to do work. These molecules move at a random but constant speed from areas of high concentration to low concentration in a solvent through a semi-permeable membrane. This is called diffusion, and when cells diffuse water through a membrane it is called osmosis. This creates a new solution when the chemicals within the solvent react to each other creating equilibrium between the different molecules and their concentrations. In order to test this theory, we filled two different beakers, one with a 1% concentration of sucrose and another with 10% concentration, and obtained 4 bags made of dialysis tubing.

The start of the experiment consisted of filling up four beakers with de-ionized water to 150 ml. After the beakers were filled to the appropriate amounts they were then labeled with the

A concentration gradient is a gradual change in solute concentration between two areas, these areas are usually separated by a membrane. A gradient result from an unequal distribution across the cell membrane. When this happens, the solutes travel along the concentration gradient (Seeley, Stephens, Tate, 2005). This type of movement is called diffusion. Diffusion is the tendency of molecules to move from a higher concentrated environment to a lower concentrated environment. This movement continues until both sides are even. Diffusion across a cell membrane is a type of passive transport, a transport that does not require energy (Karp, 2010).

Within every cell, a movement of a solvent occurs through a semipermeable membrane to equalize the concentration of solute on both sides of the membrane. The diffusion of water across the cell’s membrane down to its concentration gradient is called osmosis. In this case, the concentration gradient is the difference of density between one side of the cell membrane to the other. Since the cell’s membrane is permeable, particles can flow freely in and out of the cell, but the net flow will be strong in the direction of lower concentration until the system has reached a stage of equilibrium, the point at which both sides of the membrane are equal. In the

This experiment was used to examine the hypothesis that: Osmosis is dependent on the concentrations of the substances involved.

In this lab we are going to discovery how osmosis works using a semi-impermeable membrane a potato slice. Osmosis is known as the movement of water in and out of a cell. To understand how this works we must understand two terms. Hypotonic means the environment has less solutes compared to the inside of the cell. Hypertonic means that the environment has more solutes compared to the inside of the cell. With osmosis water will always move from hypotonic too hypertonic. So the question is will water move into the potato or out of the potato? Will these results change when placed in different morality of salt water? To calculate these results, we will measure the mass of potatoes cut into equal sizes then soak these potato slices in different morality of NaCl for thirty minutes and measure the mass change in each potato slice.

Osmosis is when water passes through a cell membrane, it is also form of a diffusion, which is a form of passive transport. Osmosis will continue to until an equilibrium is reached which is when the solutions are isotonic. This means that the solution has the same amount of solute on both sides. If the solution is hypertonic, it has more solute in the solution. In this situation water will move towards it. if the solution is hypotonic, it has less solute in the solution. Whereas in this situation, water will move out of the solution.