Hydroiodic Acid Formula

Hydroiodic Acid Formula

The aqueous solution of hydrogen iodide is the Hydroiodic Acid Formula, also known as the Hydrogen Iodide Formula. When we dissolve the hydrogen iodide gas in water, students get Hydroiodic Acid. Furthermore, in its anhydrous form, it is a molecule composed of a single hydrogen atom and an iodine atom.

However, the chemical or molecular formula for Hydroiodic Acid is unknown (HI). It is a clear liquid with no colour, an acrid odour that is odorless, and a cooling, pungent taste of saline. Hydroiodic Acid Formula is a powerful and reactive acid. It should be used with caution due to its high reactivity. It can react violently with metal powders, ammonia, and other chemicals, resulting in explosions and fire. It is extremely corrosive and reacts violently with bases. Furthermore, when heated, HI decomposes, emitting toxic fumes and rapidly oxidising in the air.

Hydroiodic Acid Formula Structure

The electronegative property of hydrogen iodide causes it to be polarized. Furthermore, because of the iodide ion’s large size, the negative charge scatters, resulting in a weaker H-I bond. This allows the H+ to be easily dissociated; thus, HI is a stronger acid when compared to HCl, HBr, and HF. 

The Hydroiodic Acid Formula is HI. It also has a molar mass of 127.91 g/mol. The hydrogen iodide is gaseous, whereas the hydroiodic acid is an aqueous solution of the HI. Both of these are interchangeable.

Properties Of Hydroiodic Acid Formula

When students put hydrogen iodide inside the water to produce hydroiodic acid, it is a gas with an acrid odour, has no colour, and is easily soluble. Furthermore, the “Concentrated” hydroiodic acid is 48% to 57% (HI) within the water. However, the HI’s exact and point-to-point physical properties in the aqueous solution, such as the boiling point, melting point, and density, are affected by the concentration of the Hydroiodic Acid Formula.


Commercially, hydroiodic acid is produced by reacting iodine (I2) with hydrazine, resulting in hydrogen iodide and nitrogen gas. Hydroiodic Acid Formula  is produced by bubbling hydrogen sulphide gas through an aqueous iodine solution.


Making alkyl iodides is one of HI’s most popular applications. An important class of organic compounds is formed by reacting the Hydroiodic Acid Formula with alkenes or primary alcohols. Hydroiodic Acid Formula is also used as a reducing agent in various industrial applications.

Health Hazards and Health Effects

The Hydroiodic Acid Formula can be extremely irritating to a person’s skin, eyes, and mucous membranes due to its toxic nature when inhaled. Hydroiodic acid can also damage the eyes and cause severe skin burns. Furthermore, it is extremely toxic if we inhale, ingest, or absorb it through our skin.

Solved Example for You

Hydroiodic acid is used to reduce propionic acid when a small amount of P is present.As a result, we will receive the following product:

 (A). Ethane.

(B). Propane.

(C). Butane.

(D). None of the above

 Answer: (B). Propane.


[H+] = 10-2.08 = 0.00832 mole/L

0.00832 mole/L X 0.775 L = 0.00645 mole HI

0.00645 mole HI X 127.9 g/mole = 0.824 g.

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