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The Effects of Solute Concentration on Percent Change in Mass of Apples and Potatoes

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Dan Pe

on 4 January 2013

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Transcript of The Effects of Solute Concentration on Percent Change in Mass of Apples and Potatoes

Finally I. Introduction The Effects of Solute Concentration On the Percent Change in Mass of Apples and Potatoes

By
Daniel Perry
Tyler Denommee II. Materials 1) 12 Cups
2.) 1 Macintosh Apple (Divided into six 2cm x 2xm x 2xm cubes)
3.) 1 Russet Potato (Divided into six 2cm x 2cm x 2cm cubes)
4.)80mL of distilled water (40mL per cup) - Control
5.)80mL of .2m sucrose solution (40mL per cup)
6.)80mL of .4m sucrose solution (40mL per cup)
7.)80mL of .6m sucrose solution (40mL per cup)
8.)80mL of .8m sucrose solution (40mL per cup)
9.)80mL of 1.0m sucrose solution (40mL per cup)
10.)1 apple slicer
11.)1 knife
12.)48 sections of paper wrap
13.)1 electronic balance
14.)1 ruler IV. Procedure 1.) Cut a Macintosh apple into 6 2cm x 2cm x 2cm cubes and remove outer skin
2.)Cut a Russet potato into 6 2cm x 2cm x 2cm cubes and remove outer skin
3.)Fill 12 cups with 40mL of each solution twice (2 cups of 40mL distilled water, 2 cups of 40mL .2m sucrose solution and so on).
4.)Label each cup for its designated sample and concentration.
5.)Label each sample for its designated cup, then take the initial mass of each sample and record your data.
6.)Place each sample in its designated cup and place 4 section of paper wrap on the top of each cup.
7.)Wait over night with each sample in its designated cup.
8.)Remove each sample from its cup and remember to label the spots of each sample.
9.) Take the final mass of each sample and record your data.
10.)Calculate the % change in mass of each sample and record your data. III. Safety Rules 1-19 General Safety
Rules 23-26 Clothing
Rules 27-28 Accidents and Injuries
Rule 40 Carrying equipment V. Data Diffusion is the movement of particles from high to low concentration. Osmosis is the diffusion of water across a semi-permeable membrane. Depending on the solute concentration however, that diffusion of water can be predicted. In a hypertonic solution, the water will move outward in order to create equilibrium due to the exterior environment having a higher concentration of solute than the interior . In a hypotonic solution, the water will move inward due to the exterior environment having a lower concentration of solute than the interior environment causing to swell and vice versa. In an isotonic solution, the solute concentration is the same interior as it is exterior so there will still be a diffusion of water, just not noticeable as the diffusion of particles has already achieved equilibrium. In this experiment, we will be testing the amount of dissolved solute in Macintosh apples and Russet potatoes by using the patterns of osmosis to determine the amount of solute in each sample. We will do this by placing Macintosh apples and Russet potatoes in different concentrations of sucrose and testing the osmolarity which is the measure of solute concentration. VI. Graphical Representation VII. Conclusion The purpose of this lab was to test the sucrose (sugar) concentration of Macintosh apples vs. Russet potatoes. From the data gathered, we can conclude that Macintosh apples have a higher concentration of sucrose (1.2m) when compared to the concentration of sucrose in Russet potatoes (around 5.7m). We know this because when our data was examined and it was averaged out for % change in mass between different concentrations of sucrose, it created a linear line. When this linear line crossed the x-axis, it showed the concentration of which the solution would have been isotonic. This is because the x-axis shows 0% change in mass, and this means the solution has achieved equilibrium and the solute concentration of the internal environment was equal to the external environment. VII. Errors Not using finite tools
Picked up samples with our hands
Errors on the electronic balance (Water on the balance, not zeroing, not substantial)
Apples not cut to the same shape
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