what happens to red blood cells in distilled water

When a red blood cell is placed in distilled water, the distilled water is hypotonic to the red blood cell, meaning it has a higher water potential than the cell. As a result, water moves from the outside to inside the cell, causing the cell to swell and eventually burst due to endosmosis. This process is called hemolysis. The absence of a cell wall in red blood cells makes them more susceptible to bursting than plant cells.