LAB ONE Diffusion and Osmosis
PART A • BEFORE: In the beaker = iodine (Lugol’s solution) • In the bag = starch + glucose • AFTER 30 MINUTES: see picture below In and out of bag Glucose found in and out of bag Starch stayed in the bag
Table 1.1 p. 2 Presence of Glucose
Part B 6 dialysis tubes were filled, each with a different concentration of sucrose from 0.2 M to 1.0 M They were placed in cups of distilled water. Wait 30 minutes. Mass the bags. 0.8M 1.0M distilled 0.6M distilled distilled distilled distilled
Part B • Table 1.2 Copy the data from your lab mates. • Table 1.3 You need to copy the group data from your period. It is posted on the chalkboard above the hood by the turtle tank. • You will then calculate the class average.
GRAPH 1.1 • Graph on the X-axis: the concentrations of sucrose • Graph on the Y-axis: the class average % difference • (see chart above)
Part C: Potato Cores • Mass two potato cores and place in different sucrose solutions from 0.2 M to 1 M.
Example of Group Percent Change in Massp. 11 Class Average • Table 1.3b: Water Potential of Potato Cores (Class Data) • Sucrose Concentration (M) Percent Change in Mass • 0.0 18.07 • 0.2 14.08 • 0.4 2.80 • 0.6 -8.10 • 0.8 -12.92 • 1.0 -9.75
Graph 1.2 Molarity is where the line crosses the O line