osmosis

• Osmosis

  Diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane
• Effect of osmosis on plant tissue

  1. Peel potato

  2. Use cork board to produce cylinders

  3. Trim cylinders to same length

  4. Measure length and mass of cylinders

  5. Place cylinders in test tubes with different solutions

  6. Leave overnight

  7. Remove cylinders, gently roll on paper towel

  8. Measure length and mass of cylinders again
• Distilled water

  Contains no dissolved substances that could affect the weight of osmosis
• Percentage change calculations

  • Increase of 0.25 g from 1.56 g = +16.03%
  • Decrease of 0.19 g from 1.32 g = -14.39%
• Concentration of sugar solution

  Affects percentage change in mass or length of potato cylinder
• Where the line crosses the x-axis, there is no change in mass as the concentration outside the cell is the same as the concentration inside