Topic 1 - Core Practical: Osmosis In Potatoes And Percentage Gain And Loss Mass Flashcards
What is the first step in measuring percentage gain or loss of mass using potato disks?
Cut potato into small discs of equal size (e.g 2cm diameter)
Equal size is important for consistency in the experiment.
What should be done to the potato disks before measuring their mass?
Blot the potato disks gently with tissue paper to remove excess water
This ensures accurate initial mass measurements.
How do you calculate the percentage change in mass?
(change in mass / start mass) × 100
The result is recorded as a percentage (%).
What is the independent variable in the osmosis experiment with potato disks?
Concentration of the sucrose solution
This is the variable that is changed during the experiment.
What is the dependent variable in the osmosis experiment?
Change in mass of the potato disks
This is what is measured as a result of changing the sucrose concentration.
What is a control variable in the potato osmosis experiment?
Diameter of the disks (2cm)
Keeping this constant ensures that any changes in mass are due to the sucrose concentration.
What process is occurring in the potato disks during the experiment?
Water is moving by osmosis from a more dilute solution to a more concentrated solution
This process occurs across a selectively permeable membrane.
Fill in the blank: The percentage change equation is _______.
(change in mass / start mass) × 100
True or False: The sucrose solutions used in the experiment can only be of a single concentration.
False
Different concentrations (e.g., 1%, 2%, etc.) are used to observe the effects on mass.
What happens to the water in the potato disks when placed in a sucrose solution?
It moves from the potato (more dilute) to the sucrose solution (more concentrated)
This results in a change in mass of the potato disks.
