5. Invert your cell model over the sink. Make sure that no liquid leaks from your Then, rinse the surface of the cell model under tap water. Place the cell model in a clean 250 mL beaker. 6. Fill the larger graduated cylinder with about 200 mL of iodine solution. if CAUTION: Avoid getting iodine on your hands. stains and is poisonous ingested. Record the volume of iodine solution on the line below. 7. Pour enough iodine solution over your cell model to cover the top surface of the cell model Record on line (d) the volume of iodine solution remaining in your graduated cylinder. 8. Allow your cell model to remain in the iodine solution overnight. To find the amount of iodine surrounding the cell, subtract the volume on line (c) from that on line (d). In the space in the table, record the amount of iodine solution sur- rounding your cell model. 9. After at least 24 hours have passed, use the attached string to lift the cell model out of the beaker. Let the excess liquid drip back into the beaker. Place the cell model in a clean, empty beaker, bowl, or container. Measure the amount of liquid remaining in the 250-mL beaker, and record this amount in the table. membrane