osmosis

• what is needed for an osmosis pratical

  • cork borer
  • themometer
  • beakers of sucrose solutions
  • mass balance
• what is a control variable for the potato

  • same age
  • species
  • surface area to volume ratio
• experiment

  • cork borer to cut potatos into equal size and length and weigh mass
  • place inside a different concentrations of sucrose solutions for half an hour
  • once done Pat dry
  • weigh final mass
• variables for experiment

  control - temperature and time

  dependant - rate of osmosis

  Independant - sucrose solutions
• if the percentage change is positive what does it mean

  • the water concentration is higher than the sucroise as the gained water via osmosis
• if percentage change is negative what does it mean

  • sucrose soolution is more than water concentration causing it to lose water via osmosis
• what is the point of control variables

  • they make test more comparable