Effect of Different Concentrations of Salt on Potato Cell Mass

Measure 500ml of tap water in the 500cm3 beaker, then measure 5g of sodium hydrogen carbonate using the 50cm3 beaker and weight scale and place in the beaker of water, using the glass rod to dissolve it into the mixture.

After they soaked, they were dried, placed back in the Petri dishes, and individually weighed again to determine whether each slice was hypotonic or hypertonic to the NaCl solution it was placed in, based on percent weight change. When the experiment was complete, Microsoft Excel was used to further analyze the data by viewing the percent weight changes for each potato slice in the form of a Scatter Plot

Measure and add 5cm3 of buffer solution using a measuring cylinder with the pH 3 into a test tube using a pipette and place the potato cylinders into the test tube.

1. Fill up a 200ml beaker with tap water and then pour it into the designated jar

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

There were no qualitative changes to the potato that could be detected by the five senses after the cubes were taken out of the water

The potato cells, took in, or gave out the water depending on the concentration of the solution it is surrounded in. The results were fine and by looking at the mass measured before the experiment, you can see that there is no reading which seems to be out of the line. As the weights before the experiment range between 2.31g and 2.46g, this tells us that the potato pieces were cut well, and I believe accurate enough. The results show that: - Osmosis actually took place in the experiment.

The hypothesis for this experiment was that at 0m and at .2m the potato core was going to swell making the surroundings it was in hypotonic. For .4m it was stated that the potato core would stay the same, making the surroundings it was in isotonic. For that last three solutions, .6m, .8m, and 1m, it was thought that they would shrink, so that would mean that that the environment that they were placed in was hypertonic. Although these

This would happen by using similar sizes and lengths of potato cylinders and applying the into different concentrations of sucrose (0,10%,30%, 50%, 70%) in foam cups then measuring the change in mass of the potato cylinders afterwards. Maintaining all variables unchanged such as pH, same size, covered solutions, and a constant temperature. The time taken for all potato cylinders will be 24 hours.

8. Use the plastic forceps to remove the potato cylinders from the beakers (keep them together in the same group), and blot off the excess solution weight on them with the paper towels.

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

First I gather all my materials needed for the experiment (see materials list). Second I peel and slice potatoes weigh each potato in grams. Get these slices to weigh the same in mass because if they vary to much in mass that could affect the results of the experiment. Third I place each potato in its own beaker. Fourth once the potatoes are placed in beakers I make sure to place enough solution to fully cover the potato. Each beaker should have a different amount of

As we can see in Figure’s 1.2 and 1.3, when there was no sucrose solution, the potato increased in weight. This is due to the fact that the sucrose solution was hypertonic in comparison to the potato slice. Through osmosis, the solution moved along the concentration gradient and into the potato slice making it hypotonic. When there were higher concentrations of sucrose solution, the potato decreased in weight. This is due to the fact that the potato was hypertonic in comparison to the potato. Through osmosis, sucrose from the potato moved along the concentration gradient out and into

6. Squirt water once from bottle onto each of the smarties on both pieces of filter paper

7.When water bath is ready, put each test tube into the water bath. Wait 5 minutes.