- Fill a gas jar with water
- Put a small quantity of strongly colored, solube solid at the bottom (you could use a straw for this)
- Time how long it takes for the liquid to reach equilibrium (until it is all the same color)
- You might want to repeat this at different temperatures of water, but that would be a separate investigation. However, science says that the higher the temperature, the faster diffusion will occur as the particles have more energy and move around faster :)
Osmosis
- Cut two cubes of potato, about 2x2x2 cm or something similar
- Weigh each one. Record their initial mass
- Place one in a concentrated sugar solution (note that salt water can also be used) and the other in distilled water (see figure 1), making sure that they are placed in the same amount of solution.
- After a set amount of time (let's say, an hour, for example), take them out and pat them dry with a tissue
- Weigh each one again. Record their new mass
- You should see that the potato's mass (in the sugar solution) would have decreased - this is because water moved through osmosis OUT of the potato. The potato's mass (in distilled water) would've increased, as water moved INTO the potato.
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| Figure 1 |
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