Osmosis polarity and tonicity lab report

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Osmosis polarity and tonicity lab report

However, these results may be inaccurate due to many sources of error that will later be discussed. The experiment was designed to enable us to calculate the percent concentration of starch in solutions A and B. Using a procedure involving osmosis occurring between the unknown substances and a solution of known concentration, we were able to calculate the percent composition of starch in solutions A and B.

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As the results demonstrate, we determined that A originally had a percent composition by mass of 1. The intent of the experiment was to study osmosis. To that effect, the experiment was successful. Osmosis occurred—there was a change in mass of both the dialysis tubing filled with a solution of unknown concentration and the beaker of sucrose and water, for both solutions A and B.

This indicates that water diffused across the semi-permeable dialysis tubing, changing the weight of both the beaker and the tubing.

When solution A was being tested, it was observed that the dialysis tubing filled with solution A weighed less after osmosis than it did before osmosis. As the dialysis tubing is semi-permeable and allows only water through, we can conclude that water diffused out of the tubing and into the beaker.

This indicates that solution A had a lower concentration of starch than that of the solution in the beaker—however, this was not supported by our calculations. When solution B was being tested, the dialysis tubing filled with solution B weighed more after osmosis than it did before osmosis.

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It can be concluded, therefore, that water diffused into the tubing and out of the beaker. This indicates that solution B had a greater concentration of starch than that of the solution in the beaker.

This was supported by the calculations made. However, there were possible factors for error in this experiment. The fact that the procedure was nonstandard may have had some impact; the amount of time that was needed for osmosis to occur fully was unknown.

The tubing may not have been submerged in the beaker for long enough to reach equilibrium. Additionally, the initial mass of the unknown solution in the dialysis tubing did not conform to the stated procedure: Though we presumed that this would not affect the results, as long as the concentration of the solution in the beaker was lower than that in the tubing, it is possible that this may have had a negative effect on our experiment.

The word osmosis refers to the diffusion of water across a selectively permeable membrane in order to evenly distribute concentration levels on both sides of the membrane. In this lab, we have used specific materials and methods to present this process.

Our hypothesis, in which we predicted that by figuring out the mass differences we would be able to figure out the percent composition of the starch in both the solutions, was correctly proven.

We stimulated our process and were able to correctly form a reasonable conclusion and percent composition. Our process used the aspect of osmosis and diffusion and provided us with a great lab.Osmosis is a type of diffusion in which water molecules move down the concentration gradient.

When the concentration of solute molecules outside the cell is lower than the concentration of solute in the cytosol, the solution outside is hypotonic to the cytosol.

AP Lab 1: Osmosis and Diffusion Lab Report - Allysha's e-Portfolio

More about tonicity on cell membrane lab report Essay Osmosis and Diffusion Lab Report Introduction All Cells Contain Membranes That Are Selectively Permeable, Allowing Certain Things to Pass Into and Leave Out of the Cell.

the Process in . Osmosis Polarity And Tonicity Lab Report Osmosis Lab Report by Evan Gerber Claire Cambron First Lab Report Wednesday am February 20, Theresa Gburek Abstract The major objective of the experiment was to test the effect of the concentration gradient on the diffusion rate.

Lab #5: Osmosis, Tonicity, and Concentration. Background. The internal environment of the human body Diffusion, Osmosis, and Tonicity Simple diffusion.

Osmosis polarity and tonicity lab report

Particles in solution are generally free to move randomly throughout the volume of the solution. Osmosis Lab 1C Data Table: 1C: During procedure 1B, one control group of distilled water and two groups of molar concentration were put into dialysis tubing and soaked in distilled water for 30 minutes.

(Click here for bottom) I i I Roman numeral for one. This is the one roman numeral that seems very natural. For the claim that Roman numerals are efficient for .

Osmosis Lab by Aakash Malhotra on Prezi