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Ammonium dichromate ((NH4)2Cr2O7)-Crystalline

Ammonium dichromate ((NH4)2Cr2O7)-Crystalline

CAS: 7789-09-5
Molecular Formula: (NH4)2Cr2O7
Purity: 99.5%-99.999%
Products Code: TR0701240800CY
Specification Model: -100 Mesh
Hazardous Class: Class 5.1
EINECS No.: 232-143-1
UN No.: UN1439
Package Class: PG II
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Ammonium dichromate ((NH4)2Cr2O7)-Crystalline introduce:


Ammonium dichromate is an inorganic compound with the formula (NH4)2Cr2O7. In this compound, as in all chromates and dichromates, chromium is in a +6 oxidation state, commonly known as hexavalent chromium. It is a salt consisting of ammonium ions and dichromate ions.

Chemical formula:(NH4)2Cr2O7

Molar mass:252.07 g/mol

Appearance:Orange-red crystals

Density:2.115 g/cm3

Melting point:180 °C (356 °F; 453 K) decomposes

Solubility in water:18.2 g/100ml (0 °C);35.6 g/100ml (20 °C);40 g/100ml (25 °C);156 g/100ml (100 °C)

Solubility:insoluble in acetone;soluble in alcohol


Catalysts, source of pure nitrogen, in lithography, manufacturing of pigmentsAmmonium dichromate is used in photo engraving, dye mordant, pigments, pickling, photography, process engraving, lithography, pyrotechnics, glazes for porcelain and china wares. It acts as a catalyst and a source of nitrogen in the laboratory and as the photoactive site. It is also used in the preparation of alizarin and chrome alum. Further, it is used in leather and oil industry for tanning and purification respectively. It is involved in the production of the phosphor raster television screens and other devices.
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