Removing Iodine From Water


mineral oil
medicine dropper
small jar with lid


1) Fill the jar half full with water.
2) Add a few drops of iodine; then replace the lid and shake (the water should now be light brown).
3) Remove the lid; add mineral oil.
4) Replace the lid and shake vigorously.
5) Let stand a few minutes.

Explanation: The iodine separates from the water because some combinations of liquids bond together better than others. In this case, the iodine bonds with the mineral oil better than with the oil, so it clings to it as it rises to the top of the water.

Return to Science and Technology Page

Becky's Guiding Resource Centre Main Menu