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the percentage of salt in the water
The one you change. The thing you change e.g. The amount of water you use to dissolve salt is the independent variable. It also goes on the x axis
No.
you can conduct the experiment but it will not prove anything because you will not have anything to compare it to. For example, if you soak a potato in salt water and it grows in size, how would you know if it was the water or the salt that made it grow? You would have to soak a potato in plain water and one in salt water to see what happens.
salt water has more mass because of the added salt so salt is heavier :)