Iodide in Salt
Iodide is often added to salt to prevent the salt from caking. The Morton marketing slogan “when it rains, it pours” refers to the ability of their salt not to cake in damp weather because iodide had been added. In addition to preventing caking, the presence of iodide in salt also meets an important nutritional requirement.
Iodide (I) oxidizes and becomes iodine (I2) when exposed to air as follows:
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