Perform classic qualitative analysis with our iodine potassium iodide solution, commonly known as Lugol’s solution or IKI solution. This reagent is widely used for detecting the presence of starches, making it essential for biology, chemistry, and food science experiments. When added to starch-containing materials, the solution produces a distinct blue-black color, allowing for fast and visually clear identification. The 30 mL bottle provides a convenient volume for repeated laboratory tests, classroom demonstrations, and controlled experimental use.
Property
Details
Chemical formula
I₂ + KI (aqueous solution)
Formula weight
Mixture
CAS number
7553-56-2 (iodine) / 7681-11-0 (potassium iodide)
Characteristics
Dark brown solution; characteristic iodine odor
Physical state
Liquid solution
Storage code
Yellow — toxic
Did You Know?
The starch test using iodine-potassium iodide is so reliable that it has been used for over a century in both classrooms and real-world applications. During World War II, iodine-based tests were used to quickly identify starch presence in foods and paper products. The dramatic color change happens because iodine molecules slip inside the spiral structure of starch, creating a charge-transfer complex that absorbs light differently.
