# Osmosis tuber experiment

A slice across a stem, at right angles to the axis of the stem, is a transverse section, T. Any slice parallel to the axis of a stem is a longitudinal section, L. Which substance s are entering the bag and which are leaving the bag? What experimental evidence supports your answer? Glucose and water left the bag, the evidence was the Testape color. Explain the results you obtained. Include the concentration differences and membrane pore size in your discussion.

The results simply state that the water, glucose, and IKI were small enough molecules to pass through the selectively permeable membrane. Quantitative data uses numbers to measure observed changes. How could this experiment be modified so that quantitative data could be collected to show that water diffused into the dialysis bag?

Quantitative data would include the initial and final percent concentrations of the glucose, therefore showing the concentration of water by the change of percent in glucose.

The movement would be noticeable in the concentration because it is known that water moves from high water potential to a Osmosis tuber experiment water potential. Based on your observations, rank the following by relative size, beginning with the smallest: The smallest substance was IKI, followed by water, glucose, the membrane pores, then the starch molecules.

What results would you expect if the experiment started with a glucose and IKI solution inside the bag and only starch and water outside? Based on the size of the molecules, the glucose and IKI would move out of the bag, the water in, and the starch left in the beaker again.

Explain the relationship between the change in mass and the molarity of sucrose within the dialysis bags. These two things are directly proportional.

As the mass increases, so does the molarity. Predict what would happen to the mass of each bag in this experiment if all the bags were placed in a 0. These are inversely proportional because whenever the sucrose molarity inside the bag is more concentrated, it will become more dilute and vise versa.

The solutions will reach equilibrium somewhere between the two concentrations. Why did you calculate the percent change in mass rather than simply using the change in mass? The percent was calculated to give the exact difference, along with considering the quantities of solution.

A dialysis bag is filled with distilled water and then placed in a sucrose solution. Calculate the percent change of mass, showing your calculations in the space below.

If a potato is allowed to dehydrate by sitting in the open air, would the water potential of the potato cells decrease or increase? The water potential of the potato would decrease because water moves from a high water potential region to a low potential region, and a dehydrated potato cell is hypertonic in comparison with the environment, forcing water to come into the cell.

The moving in part shows that the potato cell had a low water potential.The Scientific Method Scientific Method is a process of investigation where problems are identified and their explanations are tested by carrying out experiments.

Observation: An unbiased, accurate report of an event. Hypothesis: An educated guess based on observations. Experiment: An experiment is designed to test a hypothesis.

Continue Reading →. The aim of this experiment is to show how osmosis works in a plant take the visking tube out and measure the mass of it (in grams). After, we will put the visking tube back in the beaker and leave it - Experiment to Investigate Osmosis in Potatoes The aim of this experiment is to investigate the.

Jun 17,  · In fact, this osmosis experiment is a great way to teach any new biology student the gist of diffusion and the process of osmosis, regardless of age. If you’re looking to gain a strong, foundational understanding of biology, check out this introduction to basic biology course vetconnexx.com: C.

Paris. Abstract This lab was conducted in order to determine the molarity of sucrose concentration where the mass of potato tuber segments does not change, indicating an isosmotic concentration.

By calculating the change of mass of the potato tuber cells prior to incubation against the mass after 5/5(2). Osmosis experiments for high schools, including studies of Benedict's tes colloids, diffusion, Fehling's test, osmosis, plasmolysis, vitamins, colloids and crystalloids.

INSTRUCTIONS • Use black ink. You may use an HB pencil for graphs and diagrams. • Complete the boxes above with your name, centre number and candidate number.

Diffusion Osmosis Apparatus: PASCO