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Contents in Test Tube
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Initial Mass of Two Potato Strips
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Final Mass of Two Strips
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Mass Difference
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Change in Mass%
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a) Distilled Water
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1.7g
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1.8
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b) 1.0 M Sucrose
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1.7
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1.0
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c) 0.8 M Sucrose
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2.0
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1.5
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d) 0.6 M Sucrose
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1.8
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1.5
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e) 0.4 M Sucrose
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1.9
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1.7
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f) 0.2 M Sucrose
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1.6
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1.7
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Describe how the potato cylinders changed in their turgidity. Identify which of the solutions were isotonic, hypertonic, and hypotonic in relation to the potato.
What would happen to a red blood cell placed in distilled water? Why?
Determine the molar concentration of the sucrose contained in the potato strips by using the graph created in Question C. At the point where the molar concentration of the sucrose in the potato would be isotonic to the sucrose, there would be no net change in the potato mass. On the graph this is located at the 0% change. Draw a line from this place on the y-axis to intersect the line. From the line draw a line down to the x-axis to find the molarity.
Molar concentration of sucrose in potato = ___________________ M