Osmosis Practical- B1

Question 1

What are you investigating in this practical?

Answer 1

The effect of sugar or salt solutions on plant tissues

Question 2

Simply describe what you did

Answer 2

• poured a 0.0-0.5 concentrated water of sugar into test tubes and did this twice to get a reliable result.
• take off the skin of the potatoes and chop them to the same size, also weigh them to record the percentage change.
• put the potatoes in the solution for about 25-30 minutes and then take them out and dry them.
• weigh the potatoes again and find out the percentage change from the original weight and also the mean average change from both of the solutions

Question 3

What was the dependent variable?

Answer 3

The weight of the potatoes before and after being in the solutions.

Question 4

What was the independent variable?

Answer 4

The amount of sugar in the soloution

Question 5

What was the control variables?

Answer 5

Amount of solution in the test tubes, same vegetable, same time in water, correct weighing

Question 6

What is the conclusion in this practical?

Answer 6

At low concentration solution water molecules left the dilute solution to concentrated solution through a semi-permeable membrane to a high concentration in a potato through osmosis, which happened in distilled water as there was more concentration in the potato.

At high concentration solution water molecules left the potato entering the water through a semi-permeable membrane due to the potato being more dilute than the concentrated water. This happened in the 0.5 concentrated solution as there was more concentration than the potato.

Question 7

Evaluation of this practical

Answer 7

If I repeated I would have:
Repeated it three times as it would have proved any anomalies and give a more exact result.
Make sure all the surface area is the same and keep the potatoes the same length.