CAS #:

Linear Formula:

NH4Cr(SO4)2• 12H2O

MDL Number:


EC No.:



(2N) 99% Ammonium Chromium(III) Sulfate Dodecahydrate
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Ammonium Chromium(III) Sulfate Dodecahydrate Properties (Theoretical)

Compound Formula CrH28NO20S2
Molecular Weight 478.345
Appearance Blue-violet crystalline solid
Melting Point 94°C
Boiling Point N/A
Density 1.72 g/cm3
Solubility in H2O N/A
Exact Mass 480.020767
Monoisotopic Mass 480.020767
Charge 2

Ammonium Chromium(III) Sulfate Dodecahydrate Health & Safety Information

Signal Word Danger
Hazard Statements H301-H330-H315-H319-H335
Hazard Codes T+, Xn, Xi
Risk Codes 20/21/22-36/37/38
Safety Statements 26-36/37/39-45
RTECS Number N/A
Transport Information UN3288 6.1/PG II
WGK Germany N/A

About Ammonium Chromium(III) Sulfate Dodecahydrate

Ammonium Chromium(III) Sulfate Dodecahydrate is a water-soluble powder used as a mordant in dyeing. American Elements can produce materials to custom specifications by request, in addition to custom compositions for commercial and research applications and new proprietary technologies. AAmerican Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards. Typical and custom packaging is available, as is additional technical and safety (MSDS) data. Please contact us for information on lead time and pricing above.

Ammonium Chromium(III) Sulfate Dodecahydrate Synonyms

Chromic ammonium sulfate dodecahydrate; Chromium(III) ammonium sulfate dodecahydrate; Ammonium chrome alum; Ammonia chromic sulfate; Ammonium chromium(III) sulfate12-hydrate; ammonium chromium bis(sulphate) dodecahydrate; Sulfuric acid, ammonium chromium(3+) salt (2:1:1), dodecahydrate

Chemical Identifiers

Linear Formula NH4Cr(SO4)2• 12H2O
MDL Number MFCD00156120
EC No. 236-923-2
Beilstein/Reaxys No. N/A
Pubchem CID 73425430
IUPAC Name azanium; chromium(3+); hydrogen sulfate; dodecahydrate
SMILES [NH4+].O.O.O.O.O.O.O.O.O.O.O.O.OS(=O)(=O)[O-].OS(=O)(=O)[O-].[Cr+3]
InchI Identifier InChI=1S/Cr.H3N.2H2O4S.12H2O/c;;2*1-5(2,3)4;;;;;;;;;;;;/h;1H3;2*(H2,1,2,3,4);12*1H2/q+3;;;;;;;;;;;;;;;/p-1

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes, and 36,000 lb. tanker trucks.

Related Elements


See more Chromium products. Chromium (atomic symbol: Cr, atomic number: 24) is a Block D, Group 6, Period 4 element with an atomic weight of 51.9961. Chromium Bohr ModelThe number of electrons in each of Chromium's shells is 2, 8, 13, 1 and its electron configuration is [Ar] 3d5 4s1. Chromium was first discovered by Louis Nicolas Vauquelin in 1797. It was first isolated in 1798, also by Louis Nicolas Vauquelin. The chromium atom has a radius of 128 pm and a Van der Waals radius of 189 pm. In its elemental form, chromium has a lustrous steel-gray appearance. Elemental ChromiumChromium is the hardest metal element in the periodic table and the only element that exhibits antiferromagnetic ordering at room temperature, above which it tranforms into a paramagnetic solid. The most common source of chromium is chromite ore (FeCr2O4). Due to its various colorful compounds, Chromium was named after the Greek word 'chroma' meaning color.


See more Nitrogen products. Nitrogen is a Block P, Group 15, Period 2 element. Its electron configuration is [He]2s22p3. Nitrogen is an odorless, tasteless, colorless and mostly inert gas. It is the seventh most abundant element in the universe and it constitutes 78.09% (by volume) of Earth's atmosphere. Nitrogen was discovered by Daniel Rutherford in 1772.


See more Sulfur products. Sulfur (or Sulphur) (atomic symbol: S, atomic number: 16) is a Block P, Group 16, Period 3 element with an atomic radius of 32.066. Sulfur Bohr ModelThe number of electrons in each of Sulfur's shells is 2, 8, 6 and its electron configuration is [Ne] 3s2 3p4. In its elemental form, sulfur has a light yellow appearance. The sulfur atom has a covalent radius of 105 pm and a Van der Waals radius of 180 pm. In nature, sulfur can be found in hot springs, meteorites, volcanoes, and as galena, gypsum, and epsom salts. Sulfur has been known since ancient times but was not accepted as an element until 1777, when Antoine Lavoisier helped to convince the scientific community that it was an element and not a compound.


June 12, 2021
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