The hypothesis is our best, educated, qualified guess as to what we think the answer to the question is going to be.
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. 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. 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.Writing a lab report by experts in Chemistry, Physics, Biology and more Grademiners offers writing a lab report from scratch.
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Please note that due to formatting issues the flow charts had to be removed. This lab was to understand how diffusion and osmosis worked. The data that was received was consistent at some times. For part A and D of the lab, the results and calculations were consistent, but part B and C showed little consistency.
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