How does an amoeba cope with high water concentration?

Amoeba have special vacuoles that fill up with water, then moves outside of the cell and bursts. The concentration of water outside the amoeba is higher than inside the cell, because the vacuole contains mineral salts. So the concentration of water inside the vacuole is low. Therefore water molecules move from outside of the cell into the vacuole due to osmosis. Then when the vacuole becomes full it goes outside of the cell and bursts. A new vacuole is then made.