What is the role of potassium iodide on the solubility of iodine in water?
Tuesday, August 3rd, 2010 at
3:13 PM
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Elemental Iodine (I2) is not very soluble in water. The addition of Potassium Iodide produces Iodide ions (I-) in the solution.
Iodide reacts with Iodine to give a soluble I3- ion:
I2 (s) + I- (aq) –> I3- (aq)
Common ion effect. It decreases the amount of iodine that can dissolve in solution by putting iodine ions in.