How to prepare an iodine solution

Written by paul lin
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The common iodine stock, Lugol's iodine, can be used to prepare iodine solutions for lab tests, science projects and more. The solution is created using standard chemistry equipment such as a beaker, hotplate, graduated cylinder and stirring rod, along with the correct amounts of iodine compounds and distilled water. The distilled water prevents contaminants found in tap water from affecting your data. The process of creating the solution is quick and takes approximately 20 minutes.

Skill level:
Moderately Easy

Things you need

  • 2 grams potassium iodide
  • 1 gram iodine powder
  • 1,000 millilitre graduated cylinder
  • 2,000 millilitre distilled water
  • Beaker
  • Hotplate
  • Metal stirring rod

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  1. 1

    Boil a beaker filled with 2,000 millilitres of distilled water over a hotplate. Heating the water will remove the contaminants that could cause inaccuracies in your experiment and final results.

  2. 2

    Pour 2 grams of potassium iodide into a 1,000 millilitre graduated cylinder.

  3. 3

    Fill the potassium iodide cylinder with water until the meniscus hits the 200 millilitre mark. Since water curves upwards in a graduated cylinder, the meniscus represents the bottom part of the curve.

  4. 4

    Mix the water and potassium iodide solution with a metal stirring rod until the potassium iodide dissolves in the water.

  5. 5

    Pour 1 gram of iodine powder into the 1,000 millilitre graduated cylinder and mix with the metal stirring rod until the powder disappears in the solution.

  6. 6

    Continue to add and mix distilled water until the meniscus hits the 1,000 millilitre mark.

  7. 7

    Pour the solution into a glass container and store it at room temperature until ready for use.

Tips and warnings

  • Always wear proper safety equipment, such as goggles, when handling potentially harmful chemicals and compounds.

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