required practical osmosis

• osmosis


  the diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane
• • when a plant cell is placed in water, then water will move into the cell by osmosis and the cell will expand

  • if we place the plant cell into a concentrated solution, then water moves out of the plant cell by osmosis. this causes the cell to shrink
• What can affect osmosis in potatoes?

  Potato skin
• Why use a cork borer for potato cylinders?

  To ensure all cylinders have the same diameter
• What is the ideal length for potato cylinders in this experiment?

  Around 3 cm
• How do you measure the length of potato cylinders?

  Using a ruler
• What tool is used to measure the mass of potato cylinders?

  A balance
• What is added to the first test tube with potato cylinders?

  10 cm³ of 0.5 molar sugar solution
• What is added to the second test tube with potato cylinders?

  10 cm³ of 0.25 molar sugar solution
• What is added to the third test tube with potato cylinders?

  10 cm³ of distilled water
• How long should the potato cylinders be left in the solutions?

  Overnight
• What should be done after removing the potato cylinders from the test tubes?

  Gently roll them on paper towel
• What measurements are taken after osmosis occurs?

  Length and mass of the cylinders
• How is the percentage change calculated in this experiment?

  % change = change in value/original value x 100