Osmosis

Question 1

Define osmosis

Answer 1

• The net movement of water particles
• Across a partially permeable membrane
• From an area of high water concentration to an area of low water concentration

Question 2

What does water concentration refer to

Answer 2

• Ratio of water particles to solutes

Question 3

What type of movement is osmosis

Answer 3

• Passive movement of water
• Doesn’t require energy

Question 4

Summarise the osmosis required practical

Answer 4

• As the concentration of sugar solution increasesm the mass change of the potato will decrease, from a positive change to a negative change
• This is because when there is no sugar in the solution , there is a higher concentration os water in the solution than the potato and so water will diffuse into the protato via osmosis
• As the concentration of sugar solution decreases, the concentration gradient will also decrease, meaning that after a certain point, water will start to diffuse out of the potato via osmosis causing the mass of the potato to decrease