REQUIRED PRACTICAL 3 -> OSMOSIS

definition of osmosis?

diffusion of water from a dilute solution to a concentrated solution across a partially permeable membrane.

hypertonic means?

more concentrated

hypotonic means?

less concentrated

isotonic means?

same level of concentration

explain how to perform the osmosis practical? (potato practical)

1. peel the potato

2. use a cork borer to make three cylinders of potato

3. trim the cylinders to the same length

4. measure the length and width of each cylinder

5. place each cylinder into a test tube

6. put 0.2M sucrose solution, 1M sucrose solution, and distilled water into the test tubes. (one each 10cm cubed of each)

7. leave them in for 20 minutes

8. take them out and put then on paper towels to remove excess liquid

9. measure the length and mass again

10. measure the percentage change

what is the equation for percentage change?

% change = change in value / original value x 100