Submitted by sat on 25 February 2015
Answer updated 17/01/2023
The experiment from this website has been tried and works well: https://practicalbiology.org/exchange-of-materials/osmosis/investigating-the-effect-of-concentration-of-blackcurrant-squash-on-osmosis-in-chipped-potatoes
The experiment involves identifying how much Ribena needs to be diluted before it becomes isotonic to potato cubes.
Students then do their own investigation with a fluid of their own choice (i.e., lemonade, orange juice, etc.) to determine the correct dilution to give to a dehydrated child (i.e., with the same solute concentration as the potatoes).
This experiment uses vinegar to dissolve egg shells: https://untamedscience.com/biology/cells/osmosis/
The shell-less eggs are placed in hypotonic, hypertonic, and isotonic solutions, and the change in mass is observed. Note that this experiment requires attention over a few days (unless you prepare the eggs in advance for the class).