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The p-Block Elements
Iodine is not very soluble in water, therefore the iodine reagent is made by dissolving iodine in water in the presence of potassium iodide. This makes a linear triiodide ion complex with is soluble. The triiodide ion ion slips into the coil of the starch causing an intense blue-black colour.
KI → K+ + I-
I2 + I- → I3-
Thus the reaction of
I2 + 2KI → KI + KI3
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