In the carrot experiment to demonstrate osmosis, we would expect the string around the carrot placed in salt water to be tighter than the one placed in tap water, because both the salt and the water diffuse into the carrot.

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In the carrot experiment, the string around the carrot placed in salt water becomes looser, not tighter, because water diffuses out of the carrot into the salt water (a hypertonic solution) to balance the concentration of solutes, causing the carrot to shrink.

In the Carrot Experiment to Demonstrate Osmosis, We Would Expect