Bio1 - Osmosis (potato chip in three test tubes)

Question 1

What are the three (/multiple) test tubes filled with in the osmosis practical (different substances) ?

Answer 1

One is filled with distilled water, the other is filled with 1/2 concentration of sugar / salt solution, the other is filled with a full concentration of sugar/salt solution

Question 2

What is the hypotonic test tube in the osmosis practical?

Answer 2

The water

Question 3

What is the isotonic test tube in the osmosis practical?

Answer 3

1/2 sugar / salt solution

Question 4

What is the hypertonic test tube in the osmosis practical?

Answer 4

Strong salt / sugar solution

Question 5

What is the method for the osmosis practical? (6 parts)

Answer 5

1. Use cork borer to cut 5 potato cylinders with same diameter.
2. Use scalpel / ruler to trim and ensure all same length
3. Measure initial mass of each and record in table of values
4. Measure 10cm ³ of each sugar / salt solution and pour into each boiling tube. Label each clearly (one should be distilled water)
   5.add a potato cylinder to each tube and leave for specified amount of time.
5. Remove potatoes. Leave to dry and record final mass/length for each.

Question 7

What usually happens to the 3 potato cylinders after the osmosis experiment?

Answer 7

Strong sugar - potato shrivels
Medium sugar - small change
Water solution - potato expands