At room temperature and pressure, the compound exists as orange, acidic crystals soluble in water and alcohol. It is formed by the action of chromic acid on ammonium hydroxide with subsequent crystallisation.
The (NH4)2Cr2O7 crystal (C2/c, z=4) contains a single type of ammonium ion, at sites of symmetry C1 (2, 3). Each NH4+ centre is surrounded irregularly by eight oxygen atoms at N-O distances ranging from ca. 2.83 to ca. 3.17 Å, typical of hydrogen bonds
USES / APPLICATIONS:
Used in pyrotechnics, in the early days of photography as well as in lithography, as a source of pure nitrogen in the laboratory, as a catalyst. It is also used as a mordant for dyeing pigments, in the manufacturing of alizarin, chrome alum, leather tanning and oil purification. The ammonium dichromate acts as the photoactive site.
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Export- 50 kg fibre drums.