Osmosis Lab Report

Diffusion is defined as the movement of molecules from an area of high concentration to an area of low concentration. The diffusion of water molecules through a semi-permeable(selectively permeable) membrane is osmosis. Semi-permeable means that some molecules can move through the membrane while others can not. Diffusion and Osmosis are passive forms of transport requiring no energy. Active Transport utilizes energy in the form of ATP. Water is a solvent that can dissolve a number of substances more than any other substance. Wherever water goes, through the ground or a body, it takes along valuable molecules. Water’s chemical composition causes it to be attracted to many different molecules and be attracted so strongly it disrupts the forces and dissolves it. Water can pass through the semipermeable membrane without any help but can change the solution, on the other side of the cell membrane, depending on how much it diffuses in and out.

Diffusion and osmosis happens in everyones everyday way of living, this can include when you spray your deodorant before school in the bathroom to then find going into the next room your still chocking on the dry smell of the deodorant this is diffusion when the particles in the air move from one place to another. Other example is when you go to have a bath, you fill the water put a bath bomb in the water and go get your towel and clothes when you get the bath bomb is gone but some little piece may be left over this is Osmosis this happens when two different concentrated solutions are separated then the solvent will then diffuse by the membrane from the less concentrated solution over to the more concentrated solution,

Osmosis • Introduction This experiment will prove how osmosis occurs by using dialysis bags, the water molecules will move through a semipermeable bag from a higher concentration to a lower concentration of water. Each beaker will represent hypertonic, hypotonic, and isotonic solutions. This experiment will demonstrate the process of osmosis in different solutions. Definitions of the main concepts used in this experiment: - Osmosis is the net movement of water molecules across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.

The gummy bear lab is an example of osmosis. It is set up like this: we received two gummy bear of the same color, red. Then, we measured the gummy bears’ volume, 2340 mm3. One was put in a water about 100 ml and the other was put in a ziploc bag to contain the moisture. This is because the gummy bear in the bag is our constant, we don’t want it to change. Another day passed and we collected data. Not surprisingly, the gummy bear in the water almost tripled in size, 6000 mm3. This is because of diffusion. The gummy bear had a higher concentration than the water, a lower concentration. That is why the water molecules movement went inside the bear. Another example, of osmosis is the eggsperiment. The teacher dumped eggs into a vinegar solution

Dialysis membrane is used to demonstrate the semi-permeable membrane of the cells. The flow of water within cells is driven by osmosis. Osmosis is dependent on the portion of the membrane, whether dialysis membrane or the membrane of the cell, which is in contact with the fluid that needs to be transported (Devuyst and Goffin, 2008). Dialysis membrane has microscopic pores which allow the passage of very small molecules like water, but large molecules cannot pass through. The concentration gradient helps to determine how much water or how many solute particles will pass through the membrane and in what direction they will flow.

Osmosis is when an object is put into a liquid, and the water molecules are all crammed together inside the object (gummy bear). They move through the only open exit, the membrane. This changes the size and weight of the object.

Osmosis is the "net movement of water molecules from an area of high water potential to an area of low water potential through a partially permeable membrane." The diagram below illustrates the process of osmosis. (See Figure 1)

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).

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).

Osmosis is a process in which molecules in a solvent pass across a semipermeable membrane into a more concentrated solution from a less concentrated one, attempting to make both sides isotonic or equal to each other. Isotonic can also be described as an equilibrium, where there is no net movement of the molecules. Osmosis is relevant in everyday life whether the general population is aware of it or not. It could be as simple as sitting in the pool too long and getting pruney fingers or as complex as a cholera infection in the intestinal cells that does not allow the intestinal cells

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 a natural occurrence constantly happening within the cells of all living things. For osmosis to occur, water molecules must move across a semipermeable membrane from an area of low concentration to an are of high concentration. In order to understand osmosis, people must understand the different types of concentrations that can be present within solution. One of them is an Isotonic solution where the concentration of dissolved particles is equal to that of a cell’s. Another is a hypertonic solution where there is a higher concentration of dissolved particles then inside the cell. And lastly there is a hypotonic solution where there are less dissolved particles than inside the cell. As dissolved particles move to a region of lower concentration, water moves the opposite direction as a result of there being less water in the highly concentrated region. In this experiment, gummy bears were placed in salt water, sugar water, and tap water to find the measure of osmosis between the solution and gummy bear.

In this lab the act of osmosis will be shown in gummy bears when added in different kinds of liquids. To begin the experiment, there’s a need of understanding of the movement of cells and what happens when substance goes in or leaves a cell. What gives molecules permission to go in and leave a living organism's cell is the cell membrane. The cell membrane is able to choose when to become “spongy” in living organisms. It can also distinguish molecules even though they might be the same size, and this is the difference between a non-living thing and a living organism. Some things that are non-living do allow some substances or molecules to leave and enter them, though it can’t separate some of the molecules.(2)

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The purpose of this lab is to test the effect of osmosis on cucumber slices. If a cucumber slice is placed in a hypertonic solution, then the mass of the cucumber slice will decrease. Whereas, if