low salt concentration means the potatoes gain mass, medium salt concentration means there is littlechange in mass, high salt concentration means potatoes lose mass
when there is a low salt concentration, there is a higher concentration of water outside the potato cells, so the water moves into the cells
when there is a medium salt concentration, there is the same water concentration inside and outside the cells
when there is a high salt concentration there is a higher concentration of water inside the potato cells, so the water moves out of the cells