You will investigate how osmosis occurs using an uncooked chicken egg as a model. For consistency, we assigned each person their own, separate task to reform to each potato cylinder. You will need to supply the following in your lab report for experiment 3. Osmosis can be defined as the diffusion of water through a selectively permeable membrane. The experiment report, ib biology lab ia examples of potato osmosis. Find the difference of the weights according to the corresponding concentration.
Diffusion has to do with shifting particles until different sides have a similar number of particles. This is the point where the concentrations in both areas are equal and no net movement will occur from one area to another. We then observed the movement of carmine particles under the microscope, first with low power, and then on high power, and recorded the results. Next, we placed the bag into the beaker with water for 30 minutes, allowing the untied end to hang over the edge of the beaker. New York: Pearson Education Inc. There are different environments created due to diffusion.
Potatoes are full of sucrose used for energy storage in plants. For solution A, the dialysis tubing weighed less after osmosis. Water will always move from areas of high water potential to areas of low water potential. To further this experiment, different types of syrup could be tested compared to water. Diffusion and osmosis occur because the concentrations should somewhat equal out Sheppard 1. A good example would be the experiments with the concentrations of10% and 70% concentration results to show the change.
Mullins Date: January 20, 2011 Introduction This lab was designed to explain the different things osmosis does. Hypotonic is when the solution has a lower solute concentration compared to the water potential. The beakers were labeled accordingly, and then 20 g, 40 g, and 80 g respectively of table sugar was weighed out using a digital scale and placed into the corresponding beakers. We knew that the dialysis bag would allow some small substances to pass through it, but stop the larger molecules. The bag that contained the most weight was the 60% sucrose bag due to the fact that it had the largest difference in concentration of sucrose to water and the water diffused the quickest across the membrane.
After that, we placed our cup where the teacher told us to. As this happened, the mass rose 1. The purpose of the lab was to determine whether or not osmosis is affect by tonicity. At the end of the incubation, we removed the potato samples, and recorded the time. The decrease in water decreases its weight. We placed all seven potato samples in a covered Petri dish so they would not dry out. The three types of concentrations are hypotonic, hypertonic, and isotonic.
A solution is hypertonic if its concentration of dissolved substances is greater than the concentration inside the cell. The cell membrane is similar to the membrane mentioned above, so the cell would lose water because of osmosis if it were placed in an environment in which water concentration is greater than that of the cell. While the cucumber slices that were submerged in distilled water swelled. As the water went into the egg it gained mass. The purpose was to identify concentrations of sucrose solutions that we were given.
Finally: Then, yet again, write up another and your final fantastic lab report. So water is drawn out of the cell by osmosis. After all the data was collected, we had to use a corrected cumulative change in weight equation to fix any variations in our data. Both diffusion and osmosis do not require energy, so they are considered. Accumulate 1 white and 1 sweet potato. In the first and second trials, use the sweet potatoes.
Five artificial cells were created, each being filled with different concentrated solutions of sucrose. Biology 1, Period 3 March 15, 2010. In conducting this as an experiment, we can determine what the solute concentration of potatoes is. Opposite of this, when the potatoes are in a lower sugar concentration than their cell sap, the concentration of water is higher outside the cell so the water moves in the cell causing the potatoes to gain mass through the process of osmosis. Using this information, another experiment was conducted with potato cores submerged in sucrose solution to further examine osmosis. After time is up, remove the cores from the sucrose solutions and mass them.
Cucumber slices 3 and 4 increased significantly in weight after the submersion in distilled water. This is due to the fact that the change in mass occurs in osmosis. After pulling out the distilled water dialysis tubing we observed a slight error in the tying of the knot which may have corrupted our results and allowed water to pass through the top. Fun thing cruise essays soul man under socialism analysis essay attention grabber for holocaust essay winners osmosis lab report essays. Activity 2 - Design an experiment: Osmolarity of potato tissues. During the fifty minutes water diffused through the egg to higher concentration, the egg. Temperature:Temperature is one of the factors that affect osmosis, due to theexistence of more kinetic energy as temperature increases meaningmore effective collisions so we start by Using room temp to maintainVariable Reason? In addition, we made sure that all of the bags were soft and floppy instead of firm to insure that experiment would work properly.