Osmosis practical

• 1. Cut up a potato into identical cylinders, get some beakers with different sugar solutions in them. One should be pure water and another should be every concentrated sugar solution, then leave a few others with concentrations in-between.
• 2. Measure the mass of the cylinders.then leave one cylinder in each beaker from 24 hours or so.
• 3. Then take them out and dry them with a paper towel and measure the mass again.
• 4. If the cylinders have drawn in water through osmosis they'll have increased in mass. If water has been drawn out they'll have decreased in mass. Calculate the percentage change in mass and plot a graph.
• 5. The dependant variable is the potato mass, the independent variable is the concentration of the sugar solution. The other variables are kept the same to keep a fair test.
• If the potato cylinder isn't completely dried there will be extra mass on it when weighed giving it a higher mass.
• If water evaporated from the beakers the sugar solution concentrations will change.
• Reduce the chance of errors by repeating the experiment.