B1b - osmosis RP

Question 1

what is the purpose of the osmosis experiment

Answer 1

the more solute dissolved, the more concentrated the solution is

Question 2

what is the risk assessment for the osmosis experiment

Answer 2

cutting the potato - cutting yourself or others - take caution and keep a safe distance

Question 3

why should you dry the cylinders before reweighing them in the osmosis experiment

Answer 3

the water on the surface will make them appear heavier

Question 4

why is it better to measure the change in mass/percentage change rather than just the final mass in the osmosis experiment

Answer 4

allows a clear comparison to be made even if the starting masses are slightly different

Question 5

what is the independent variable in the osmosis experiment

Answer 5

concentration of sugar/salt

Question 6

what is the dependent variable in the osmosis experiment

Answer 6

the change in mass of the potatoes

Question 7

what are the control variables of the osmosis experiment

Answer 7

• temperature
• time the cylinders are left for
• shape of cylinders
• cylinders should be fully submerged
• use the same potato
• dry cylinders before reweighing them

Question 8

what is the method for the osmosis experiment

Answer 8

1. cut cylinders of potato and measure their mass
2. place cylinders in different concentrations of sugar/salt
3. after 30-60 mins, remove them and dab them dry before reweighing them
4. calculate the change in mass