LAB ONE

LAB ONEDiffusion and OsmosisPART ABEFORE: In the beaker = iodine (Lugols solution)In the bag = starch + glucoseAFTER 30 MINUTES: see picture below

In and out of bagGlucose found in and out of bag

Starch stayed in the bagTable 1.1 p. 2Initial ContentsSolution ColorInitialFinalInitial FinalBag15%glucose+1% starchclearBlue-black++BeakerWater and iodineStraw yellowStraw yellow-+Presence of GlucosePart B

distilleddistilled

distilleddistilleddistilled0.6M0.8M1.0M6 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.

Part BTable 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 1.1Graph on the X-axis: the concentrations of sucroseGraph on the Y-axis: the class average % difference(see chart above)

Part C: Potato CoresMass 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 AverageTable 1.3b: Water Potential of Potato Cores (Class Data)

Sucrose Concentration (M)Percent Change in Mass0.0 18.070.214.080.42.800.6-8.100.8-12.921.0-9.75

Graph 1.2

Molarity is where the line crosses the O line