Question

why iodine solutions are prepared using potassium iodide​

Answer 1

The reason for preparation of Iodine solutions using KI is :

Because of reducing nature and less solubility of Iodine.

Iodine is thus, mixed with KI to form KI3 which is even more stable than KI.

Answer 2

Iodine solutions are prepared using potassium iodide​ because of the following reasons:

1. Potassium Iodide(KI) coverts the insoluble iodine( I₂) to soluble Iodide ion( I3-).
2. Concentration of iodine is increases in the solution.

Lugol's solution

• KI mixed with I2 forms Lugol's solution.
• Lugol's solution is an equimolar solution of iodine and potassium iodide.

Reaction:

               KI + I₂ → KI₃

• I2 insoluble in water.
• KI3 contains I3- ion, which is soluble in water