EDITORIAL IMAGE / SCIENCE PHOTO LIBRARY EDITORIAL IMAGE / SCIENCE PHOTO LIBRARY
Iodine in water, 1 in a series of 2. This image shows that Iodine (I2) is only sparingly soluble in water. The second image shows that with the addition of iodide ions; in this case a small amount of Potassium Iodide (KI); the iodine is converted to triiodide ion; which readily dissolves.
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