Osmosis - PRACTICAL Flashcards
Cell Biology (15 cards)
What is the first step in the potato osmosis experiment?
Cut up an potato into identical cylinders and prepare beakers with different sugar solutions.
What should one of the sugar solutions be in the potato osmosis experiment?
Pure water.
What is an example of a very concentrated sugar solution concentration mentioned?
1 mol/dm2.
List three example concentrations for the sugar solutions used in the experiment.
- 0.2 mol/dm2
- 0.4 mol/dm2
- 0.8 mol/dm2
What is the procedure for measuring the effect of sugar concentration on potato cylinders?
Measure the mass of the cylinders, soak them in solutions for 24 hours, dry them, and measure their mass again.
What does an increase in mass of the potato cylinders indicate?
Water has been drawn in by osmosis.
What indicates that water has been drawn out of the potato cylinders?
A decrease in mass.
How is the percentage change in mass calculated in the experiment?
By comparing the initial and final masses of the potato cylinders.
What is the dependent variable in the potato osmosis experiment?
Change in mass of the potato cylinders.
What is the independent variable in the potato osmosis experiment?
Concentration of the sugar solution.
What must be kept constant to ensure a fair test in the experiment?
- Volume of solution
- Temperature
- Time
- Type of sugar used
True or False: Errors in the potato osmosis experiment can occur if potato cylinders are not fully dried.
True.
What is one way to reduce the effects of errors in the experiment?
Repeat the experiment and calculate a mean percentage change at each concentration.
What might happen if water evaporates from the beakers during the experiment?
The concentrations of the sugar solutions would change.
Fill in the blank: The experiment compares the effect of sugar concentration on _______.
potato chip mass.
