A Molarity Lab

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  • Topic: Concentration, Molar concentration, Chemistry
  • Pages : 6 (1061 words )
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  • Published : October 14, 2012
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Names: Benjamin Fischmann
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What is the Molar Concentration (Solute concentration) of a Potato? -------------------------------------------------

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Design
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1. What is the dependent variable for this experiment?
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The dependent variable is the concentration (solute) of the potato. -------------------------------------------------

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2. What is the independent variable for this experiment?
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The independent variable is the concentration (solute) in which the potatoes are put in. -------------------------------------------------

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3. What were some controlled variables (constants) for this experiment? -------------------------------------------------
A particularly important controlled variable in this experiment was the type or batch of potatoes. This is because; often potatoes sold on the same supermarket may come from different places and therefore affect the experimental results. Another controlled variable was the place in which potatoes were placed; they were placed under the same sunlight/shade, same room temperature and general area of the class. This was done with a final objective of making the environment equal to all potato samples undergoing the experiment. Finally, another important controlled variable was the amount of time that each potato was left in solution. -------------------------------------------------

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4. Was there a control group in this experiment? Explain.
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Yes there was. The control group for our experiment was the potato in the 0.0 molar solution concentration. This solute was the one without any salt. Now, the reason why such a control group was set out is because a reference point to set the standard was needed. In other words, the experiment needed a standard to see and calculate how much the solution needed. -------------------------------------------------

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Data Collection and Analysis
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Masses and Their Percent Change in Different Salt Solutions
Concentration NaCl| Initial Mass (±0.01 grams)| Final Mass (±0.01 grams)| Change in Mass (±0.01 grams)| % Change in Mass| 0 M (H block)| 2.33| 2.86| 0.53| 22.75%|
0 M (E block)| NA| NA| NA| NA|
0 M (B block)| 3.60| 4.30| 0.7| 19.44%|
 |  |  |  |  |
0.2 M (H block)| 3.39| 3.08| -0.31| -9.14%|
0.2 M (E block)| 3.49| 2.95| -0.54| -15.47%|
0.2 M (B block)| 4.84| 4.27| -0.57| -11.78%|
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0.4 M (H block)| 3.34| 2.53| -0.81| -24.25%|
0.4 M (E block)| 4.96| 3.7| -1.26| -25.40%|
0.4 M (B block)| 4.35| 3.36| -0.99| -22.76%|
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0.5 M (E block)| 14.49| 10.02| -4.47| -30.85%|
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0.6 M (H block)| 5.15| 3.88| -1.27| -24.66%|
0.6 M (E block)| NA| NA| NA| NA|
0.6 M (B block)| 2.61| 2.04| -0.57| -21.84%|
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0.8 M (H block)| 2.76| 2.2| -0.56| -20.29%|
0.8 M (E block)| NA| NA| NA| NA|
0.8 M (B block)| 5.03| 3.88| -1.15| -22.86%|
0.8 M (H block)| 1.47| 1.25| -0.22| -14.97%|
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1.0 M (H block)| 1.12| 0.86| -0.26| -23.21%|
1.0 M (E block)| 3.67| 2.96| -0.71|...
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