Give the balanced chemical equation and the observation when iodine is added to a solution of potassium iodide.
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`I_2` is a violet colour element. But it is not soluble in water.It is highly soluble in non-polar solutions like KI.
`KI+I_2 rarr KI_3`
This `KI_3` is highly water soluble. If this is heated we can see the violet colour I_2 vapour.
`KI_3` is used in `I_2` based redox reactions.
`KI_3` is also known as Lugos solution which is used in medical purposes.
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