Question

A student wants to model the net movement of water out of a cell using a semi-permeable bag, water, a large beaker, and salt. Which setup could he use to model the net movement of water out of a cell? Responses A Place a bag containing a 30% salt solution into a beaker containing a 10% salt solutionPlace a bag containing a 30% salt solution into a beaker containing a 10% salt solution B Place a bag containing a 30% salt solution into a beaker containing a 20% salt solutionPlace a bag containing a 30% salt solution into a beaker containing a 20% salt solution C Place a bag containing a 10% salt solution into a beaker containing a 10% salt solutionPlace a bag containing a 10% salt solution into a beaker containing a 10% salt solution D Place a bag containing a 20% salt solution into a beaker containing a 40% salt solution

Answer 1

To model the net movement of water out of a cell using a semi-permeable bag, the student needs to create a scenario where the concentration of solutes (in this case, salt) is higher inside the bag compared to the outside solution. This setup will allow water to move out of the bag (or “cell”) into the beaker (or extracellular environment) in an attempt to dilute the higher concentration of salt.

Among the given options, the correct setup is:

**A: Place a bag containing a 30% salt solution into a beaker containing a 10% salt solution.**

In this setup, the concentration of salt is greater inside the bag (30%) than outside in the beaker (10%). Water will move out of the bag into the beaker to try to equalize the concentration, demonstrating the net movement of water out of a cell due to osmosis.

Other options do not fulfill the requirement of having a higher concentration of solutes inside the bag compared to the beaker.