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When demonstrating osmosis: 1 - Leaving Cert Biology - Question iii - 2017
Question iii
When demonstrating osmosis: 1. What did you use as a selectively-permeable membrane? 2. What led you to conclude osmosis had occurred?
Worked Solution & Example Answer:When demonstrating osmosis: 1 - Leaving Cert Biology - Question iii - 2017
Step 1
What did you use as a selectively-permeable membrane?
Answer
In the experiment demonstrating osmosis, I used Visking tubing as the selectively-permeable membrane. This material allows certain molecules, such as water, to pass through while restricting others, thus effectively simulating the conditions needed to observe osmosis.
Step 2
What led you to conclude osmosis had occurred?
Answer
I concluded that osmosis had occurred due to the increase in mass (or volume) of the more concentrated solution inside the Visking tubing. This change indicated that water moved from an area of lower solute concentration to an area of higher solute concentration, which is the defining characteristic of osmosis.