Ammonium Dichromate, Formula, Preparation Method, Chemical Properties

Ammonium Dichromate

Ammonium dichromate is  an inorganic compound and has a red orange crystallization. It could leaves the green residue at the room temperature. Ammonium dichromate is more sensitive to light and acts as a reliable oxidizing agent. These have consists of ammonium ions and dichromate ions. Due to the decomposition of the material it would be ruptured.  The systematic IUPAC name is known as ammonium dichromate. The chemical or molecular formula of ammonium dichromate is  (NH4)2Cr2O7.

Structural Formula

This is the structural formula of the ammonium dichromate:

Ammonium Dichromate

Chemical Formula

The chemical formula of the ammonium dichromate is (NH4)2Cr2O7.

Preparation method

When the ammonium dichromate is undergoes to the decomposition at room temperatures it give the result of chromium III oxide and nitrogen gas formation. It is more hazardous to the environment. It has contains a single type of ammonium salts at the same symmetry to the typical of hydrogen bonds. It is crystalled in nature. These hydrogen bonds is symmetrical in naturally point of ammonium salts.

Learn More:   Potassium Chromate, Formula, Chemical Properties, Preparation, Uses

(NH4)2Cr2O7 → Cr2O3 + N2 + 4H2

Physical Properties

Melting point 180C
Boiling point decomposes
Molecular weight 252.07g/mol
Density 2.115g/cm3
Solubility in water 18.2g/100mL
Solubility Insoluble in acetone

Soluble in alcohol

Crystal structure Monoclinic
Appearance Orange red crystals

Chemical Properties

The melting point is very low and the boiling point is decomposed. It is monoclinic in structure. It is insoluble in acetones and alcohols. It has a low density and medium molecular weight. It is orange red crystals in the appearance.


Ammonium dichromate is mainly used in lithography. It is a sensitizing solutions. It is used as a pyrotechnics, lithograpy, photoengraving. It is widely used magnetic recording material. It is used in agricultural field approved as a pesticide. Usually used as a mordant Dyeing and pigment.


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