8a, 8b & 8c – To Investigate Factors Affecting Rates of Osmosis Across Semi-Permeable Membranes (LC 2027) (Leaving Cert Biology): Flashcards

Water molecules moving across semi-permeable membrane from high to low water concentration

Semi-permeable membrane allowing water through, blocking sucrose

Higher temperature = faster osmosis rate

Steeper gradient = faster osmosis rate

Larger surface area = faster osmosis rate

Difference in concentration between inside and outside solution

Increases molecular kinetic energy, molecules move faster

Greater difference in water potential = stronger driving force

More membrane pores available for water transport

Temperature, concentration gradient, surface area

$(\text{change in mass} \div \text{initial mass}) \times 100$

From high to low water potential

Volume, membrane type, time, water volume, handling

40°C (highest temperature tested)

80% sucrose solution (steepest gradient)