osmosis

• step 1

  cut up a potato into identical cylinders and get beakers of different sugar solutions.

  from pure water to 0.6mol/dm cubed
• step 2

  measure the mass of the cylinders then leave the potatos in different beakers for 24 hours
• step 3

  take them out the solution and dry them with a paper towel and measure the masses again
• results

  -if the potatos have drawn in water by osmosis, the mass will increase

  -if water has drawn out the potatos, the mass will decrease

  -calculate the percentage change in mass
• variables

  -dependent- chip mass

  -independent- concentration of sugar solution

  -control- volume of solution, temperature, time, type of sugar used
• errors

  • if potatos weren't fully dried, excess water would give a higher mass
  • if water evaporated from beakers, the concentrations of sugar solutions would change