Materials: cylinders of potato (using cork borer) knife cork borer; one big one, and one small one 4 beakers Deionized water salt solutions (1%, 5%, 10%) digital balance Glass rod Procedure:
I need help with an osmosis lab report homework. first question and chart
Materials:
- cylinders of potato (using cork borer)
- knife
- cork borer; one big one, and one small one
- 4 beakers
- Deionized water
- salt solutions (1%, 5%, 10%)
- digital balance
- Glass rod
Procedure:
1. Label 4 beakers (use small—50ml—plastic beakers) with the following: 0 % salt (deionized water), 1% salt, 5% salt and 10% salt. (Label beakers using masking tape – do NOT write on the beakers)
2. Put the correct solution in each beaker. Use enough of the appropriate solution to fill about half of the beaker.
3. Using a cork borer, take four cores from a potato and use a knife to cut four potato cylinders about 3 cms. long. Caution: be very careful with the knife. Always cut away from yourself. Make sure there is no peel left on the cylinder.
4. Place the potato cylinders on weighing dishes and place one dish in front of each beaker. When you are ready, remove one cylinder at a time and weigh it. You should weigh them to the nearest 0.1 g. Record the initial weight in Table.
Note: Use a weighing dish and tare the balance. Never place specimens directly on the balance pan.
4. Immediately return the cylinder to the weighing dish in front of the correct beaker. Cut into two longitudinal pieces and transfer them to the first beaker and note the time.
5. Repeat steps # 3 and 4 for the remaining cylinders. Incubate the potatoes in various solutions for 30 min.
6. Stir the potato cylinders occasionally with a glass rod.
7. After 30 minutes, remove two pieces of each cylinder from its beaker. Briefly blot them with a paper towel to remove excess water. Do not leave the cylinders sitting on paper towels. Use the weighing boat and weigh both pieces of each cylinder and record the weight in the Table. (Don’t forget to tare the balance before each use)
Repeat this process until all potatoes have been weighed in the same order in which they were initially placed in each solution.
8. Calculate the total weight change by subtracting the initial weight from the 30 minute final weight. Record this in Table.
9. Calculate the percent change for each cylinder. Percent change is calculated as follows:
9. Record your data in a table.
10. Display your data in a line graph using the graph paper provided. Graphs should be clearly labelled (include title, axis labels (with units), legend/key, clear unit measurements on each axis.
Data Table: Change in Weight Based on Concentration of Solution
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