In an investigation of osmosis, apple cores were submerged in different molarity solutions to determine the unknown osmolarity of the apple. To determine the molarity five uniform apple cores were massed before submerging them in different molarity solutions. After 24 hours the apple cores were massed again. Then the percent change in mass was determined for the five uniform apple cores in each molarity solution.
Molarity of Solution
Average % Change of Mass of Apple Cores
0.0 M
21.5
0.2 M
8.0
0.4 M
-7.4
0.6 M
-19.2
0.8 M
-22.7
1.0 M
-36.3
Construct an appropriately labeled graph to illustrate the percent change in mass of the apples in the different solutions.
(b) Identify the osmolarity of the apple.
(c) Describe the environmental conditions taking place in each of the six solutions with the apples.
(d) Determine the water potential of the apple core in the experiment at room temperature of 23OC.
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