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General
Systematic name	?
Other names	Ammonium Pyrochromate
Molecular formula	(NH4)2Cr2O7
SMILES	?
Molar mass	252.07 g/mol
Appearance	Orange crystalline solid
CAS number	7789-09-5
Properties
Density and phase	2.15 g/cm3, ?
Solubility in water	36.4 g/100 ml (20°C)
Melting point	180°C (? K)
Boiling point	NA °C (? K)
Acidity (p''K''a)	?
Basicity (p''K''b)	?
Chiral rotation [α]D	?°
Viscosity	? cP at ?°C
Structure
Molecular shape	?
Coordination geometry	?
Crystal structure	?
Dipole moment	? D
Hazards
MSDS	External MSDS
Main hazards	?
NFPA 704
Flash point	?°C
R/S statement	R: ? S: ?
RTECS number	?
Supplementary data page
Structure and properties	''n'', εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Related compounds
Other anions	?
Other cations	?
Related ?	?
Related compounds	?
Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa)

'Ammonium dichromate', (NH₄)₂Cr₂O₇, sometimes known as ''Vesuvian Fire'', is a chemical compound that was used as an oxidizer in early photography and pyrotechnics, and in the formation of tabletop "volcanoes". This can be done simply by igniting the salt. The following reaction occurs:
(NH₄)₂Cr₂O₇(s) → Cr₂O₃(s) + N₂(g) + 4H₂O(g)
The reaction proceeds to completion once initiated.

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