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why are salt and sugars used in osmosis experiments. How could you decide which gives the clearest results
Answers
Explanation:
Prepare a range of sucrose solution concentrations. The concentration of a solution is measured in moles per cubic decimetre written as mol dm-3. For example, in this experiment your range could be from 0.2 mol dm-3 to 1.0 mol dm-3.
A 1.0 mol dm-3 solution of sucrose will contain up to 342 g of sucrose per dm-3. A 1.0 mol dm-3 solution of a substance contains one mole of the substance per dm3 of a solution, or one mole per litre of solution.
Set up a series of boiling tubes each containing a different concentration of sucrose solution. Also, set up one containing distilled water. This will have a concentration of sucrose of 0.0 mol dm-3 and will act as the control in the experiment.
Make sure each tube is labelled with the concentration.
Prepare a blank results table before you begin. Use a cork borer to cut a number of potato cylinders from the same tuber, and cut them to a similar length using a scapel. Make sure when weighing the potato cylinders, that their masses are not mixed up when recording them. Each cylinder will have a different mass before and after the investigation.
Place each potato cylinder into a different sugar solution for 40 minutes.
Remove the potato and record its new mass.
Calculate percentage changes in mass for all potato cylinders.
For each sucrose solution concentration, repeat the investigation for several potato cylinders. This increases your confidence in the results - different potato cylinders might not behave in the same way. Making a series of repeat experiments means that any anomalous results can be identified and ignored when a mean is calculated.