Home Categories Inorganic chemistry Ammonium dichromate
A0694312

Ammonium dichromate , ≥99% , 7789-09-5

Synonym(s):
Ammonium bichromate;Ammonium dichromate

CAS NO.:7789-09-5

Empirical Formula: Cr2H8N2O7

Molecular Weight: 252.06

MDL number: MFCD00010879

EINECS: 232-143-1

Update time: 2022-07-08

PRODUCT Properties

Melting point: 170 °C (dec.)(lit.)
Density  2.150
vapor density  8.7 (vs air)
solubility  H2O: 1 M at 20 °C, clear, colorless
form  Solid
color  Orange to red
Odor Odorless
PH Range 3 - 4
Water Solubility  360 g/L (20 ºC)
Decomposition  170 °C
Merck  14,515
Exposure limits ACGIH: TWA 0.0002 mg/m3; STEL 0.0005 mg/m3 (Skin)
OSHA: Ceiling 0.1 mg/m3
NIOSH: IDLH 15 mg/m3; TWA 0.0002 mg/m3
Stability: Stability Strong oxidizer - contact with flammable materials may cause fire. Reactions carried out in closed vessels may lead to explosion. Incompatible with organic materials, strong reducing agents.

Description and Uses

Yellow needles made by chromic acid acting on ammonium hydroxide. The product is produced by crystallization. Ammonium dichromate was used interchangeably with potassium dichromate for sensitizing gelatin, albumen, gums, and other colloids that were used for pigment processes. Ammonium dichromate is more sensitive than the potassium alternative.

Safety

Symbol(GHS) 
GHS03,GHS05,GHS06,GHS08,GHS09
Signal word  Danger
Hazard statements  H272-H301-H312-H314-H317-H330-H334-H340-H350-H360-H372-H410
Precautionary statements  P210-P260-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338
Hazard Codes  E,T+,N
Risk Statements  45-46-60-61-2-8-21-25-26-34-42/43-48/23-50/53
Safety Statements  53-45-60-61
RIDADR  UN 1439 5.1/PG 2
WGK Germany  3
RTECS  HX7650000
Autoignition Temperature 218°C
TSCA  Yes
HazardClass  5.1
PackingGroup  II
HS Code  28415000
Toxicity LDLo scu-gpg: 25 mg/kg EQSSDX 1,1,75

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