Investigate the Osmosis in Potato Rods in Various Concentrations of Salt Solutions

When the salt in NaCl dissolves in the water Osmosis occurs. This then causes the concentration to proceed from high concentration to low concentration decreasing the mass of the potato core.

lab bench. Place a beaker from the drawer on the stir plate. Drag the bottle of NH3 to the 5 mL graduated cylinder (the smallest one) by the sink and fill the cylinder by dropping the bottle on the cylinder. Now drag the 5 mL graduated cylinder to the beaker on the stir plate and add the 5 mL of

Finally, it could also be a hypertonic solution which is when there is a higher concentration of solute in the solution than in the cell and therefore the water leaves the cell. This make the cell plasmolyzed or “shrunken”. In our experiment this means that the potato cell would

Create a water bath by filling ½ of the 100 mL beaker with cool water, adding crushed ice to the beaker so the water level is just below the top, and sprinkling salt into the beaker

2. Fill a flask with pure water (0% sugar), another with 0.2M water, another flask with 0.4 M water, and another flask with 0.8M water.

- Get 5 50mL beakers and fill the first one with 30 mL of water

The purpose of this experiment was to determine if the rate of osmosis has an impact on the concentration of solutes. During this lab varying levels of sucrose were put into dialysis bags and then into containers with varying levels of sucrose. This was done to observe how the water moved through the dialysis tubes. This process is known as osmosis is “…diffusion of water across a selectively permeable membrane from high to low concentration… (Mader et. al., 2015)”. The movement of water across the membrane can be determined by the concentration of solutes inside the dialysis bags and the solution surrounding it. If the cell is hypotonic, meaning it has a lower osmotic pressure, its water concentration is lower than that of the concentration in the cell, which can cause a rupture. If the cell is hypertonic, meaning it has a higher osmotic pressure; its water concentration is lower outside the cell then it is inside causing the cell to shrivel up. The hypothesis tested

XII. Take the 250 ml beaker to your lab bench. Set up a gravity filtration with a plastic funnel, folded wet filter paper, and an Erlenmeyer flask. Pour the content in the 250 ml beaker slowly through the filter paper. Wash the filter paper with deionized water. Dispose of the filtrate in the proper labeled waste container.

1) Separate the solid from the liquid in the beaker by decanting the liquid. Ask your instructor to demonstrate the correct procedure.

The lost of water from the vacuoles and cytoplasm pulled the cell membrane away from the cell wall. The water was diffused from a hypotonic solution to a hypertonic solution. Because the water flowed out of the cell by osmosis, the cell became more flaccid and then plasmolysed.

1. Label one glass water and the other vinegar or lemon juice depending on which acid you use.

vinegar into each beaker. Next, the crushed vitamin tablets will be added to their respective beakers with vinegar.

Filled two bags with three-quarters of water and one with the salt solution by using the pipette and the pipette pump. Closed carefully with the thread and cut the excess of bag or thread, make sure they are completely sealed before placing them in the beakers. The beakers should be labeled with the crayon and with a pen write down in the paper towel the contents of each beaker and bags respectively to avoid confusions, in the following order. 1) Bag 1 will be filled with distilled water and beaker 1 will be filled with two-thirds of 10% NaCl solution. 2) Bag 2 will be filled with 10% NaCl solution and beaker 2 will be filled with two-thirds of distilled water.

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

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.