Given what we know, we can confirm that the concentration of salt outside the cell was above 10%.
How can we know the external salt concentration?
This has to do with osmosis. Osmosis is the tendency of water to move towards a place with a higher concentration of solute. This is because of water's role as a solvent. The cell in this case shrinks because the water leaves the cell to dissolve the outside salt concentration, which tells us that it must be higher than 10%.
Therefore, we can confirm that the cell shrinks because water leaves the cell to dissolve the outside salt concentration, meaning that the outside concentration of salt is higher than 10%.
To learn more about osmosis visit:
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