Potassium Iodide is one of the most common compounds used in Chemistry. This inorganic compound is white crystalline salt which is used in many fields like medicine, commercial and industrial applications. It is an ionic compound that is produced by treating potassium hydroxide (KOH) with iodine. It is soluble in water. It is used as a nutritional supplement in animal feeds and in the human diet. The chemical formula of potassium iodide is KI and it participates in several important chemical reactions.
Potassium Iodide Chemical Formula
Potassium Iodide is a metal halide composed of potassium and iodine. (potassium and iodine formulae are K⁺ and I⁻ respectively. The bond between them is ionic. Potassium has an oxidation number of +1 and iodide has an oxidation number of -1, So, the formula for potassium iodide is KI.
Calculation of Molar Mass: The molecular formula of potassium iodide is KI, Potassium has an atomic weight 39.0983 and Iodine has an atomic weight 126.90447, Adding both of them we get: ( potassium iodine formula are K and I respectively)
126.90447 + 39.0983 = 166.0028.
Potassium Iodide can be produced in industries by treating KOH with iodine.
Structure of Potassium Iodide:
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Uses of Potassium Iodide:
It is a natural supplement for the human and animal diet.
It is added to certain salts so that iodine content is not lost during the oxidation process.
It is also helpful in protecting the body’s thyroid gland in the neck.
It is also used in photography, in the preparation of Silver Iodide.
Potassium Iodide (KI) is an important agent for protection against thyroid-related health effects. It is used with silver nitrate to make silver iodide (AgI), a chemical used in making film photography. Potassium Iodide is also used in organic synthesis mainly in the preparation of aryl iodides in the Sandmeyer reaction (Organic Chemistry).
Reactions Involving Potassium Iodide:
2CuSO₄ + 4KI → 2Cul + I₂ + 2K₂SO₄
2KI + Cl₂ → 2KCl + I₂
2KI + Br₂ → 2KBr + I₂