Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium

Cr2K2O7

dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium

CAS7778-50-9
GHS03 Gefahrensymbol: Brandfördernd – Flamme über Kreis
GHS08 Gefahrensymbol: Gesundheitsgefahr – Gesundheitsgefahr
GHS06 Gefahrensymbol: Giftig – Totenkopf mit Knochen
GHS05 Gefahrensymbol: Ätzend – Ätzwirkung
GHS09 Gefahrensymbol: Umweltgefährlich – Umwelt
Danger

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Identification

CAS Number
7778-50-9
EC Number
231-906-6
UN Number
3087
Index Number
024-002-00-6
PubChem CID
24502

Physical-chemical properties

Molecular Formula
Cr2K2O7
Molar Mass
294.18 g/mol
IUPAC Name
dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium

Chemical Identifiers

InChI
InChI=1S/2Cr.2K.7O/q;;2*+1;;;;;;2*-1
InChI Key
KMUONIBRACKNSN-UHFFFAOYSA-N

Overview

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium (CAS 7778-50-9) is a potassium dichromate compound with strong oxidizing properties and significant toxicological hazards. This orange-red crystalline compound, with the molecular formula Cr2K2O7 and molecular weight of 294.18 g/mol, represents one of the most important chromium(VI) compounds in industrial chemistry. Also known by its EC number 231-906-6, this substance belongs to the dichromate family and shares structural similarities with disodium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium, though it exhibits distinct solubility and reactivity characteristics due to its potassium cation composition. The compound's classification profile reflects its serious hazardous nature, presenting multiple risk categories including oxidizing solid (Ox. Sol. 2), carcinogenic (Carc. 1B), mutagenic (Muta. 1B), and reproductive toxicity (Repr. 1B) properties. Its acute toxicity classifications span multiple categories, necessitating the "Danger" signal word and comprehensive GHS pictogram labeling including GHS03, GHS08, GHS06, GHS05, and GHS09. Transportation regulations classify it under ADR class 5.1 as an oxidizing substance. Primary industrial applications include analytical chemistry as a powerful oxidizing agent, leather tanning processes where its chromium content provides essential cross-linking properties, and specialized photographic applications. The compound also serves in certain metal treatment processes and as a reagent in laboratory synthesis procedures. OYSI maintains availability of this controlled substance for qualified industrial customers, ensuring full regulatory compliance and proper documentation for all chromium(VI) compound distributions across European markets.

Safety & Classification

Danger
Classification:

Ox. Sol. 2; Carc. 1B; Muta. 1B; Repr. 1B; Acute Tox. 2 *; Acute Tox. 4 *; Acute Tox. 3 *; STOT RE...

HHazard Statements (H-Statements)

Describe the nature and severity of the hazard

H272

May intensify fire; oxidiser.

H350

May cause cancer.

H340

May cause genetic defects.

H330

Fatal if inhaled.

H312

Harmful in contact with skin.

H301

Toxic if swallowed.

H372

Causes damage to organs through prolonged or repeated exposure.

H314

Causes severe skin burns and eye damage.

H334

May cause allergy or asthma symptoms or breathing difficulties if inhaled.

H317

May cause an allergic skin reaction.

H400

Very toxic to aquatic life.

H410

Very toxic to aquatic life with long lasting effects.

Classification according to CLP Regulation (EC) No 1272/2008. The complete list of hazard and precautionary statements can be found in the Safety Data Sheet (SDS).

First Aid Measures

Inhalation

Fatal

Measures if vapours or dust are inhaled

First Aid Actions

  • +P304IF INHALED:
  • +P340Remove person to fresh air and keep comfortable for breathing.
  • +P311Call a POISON CENTER/doctor.

Related hazard statements:

Skin Contact

Harmful

Measures if substance contacts the skin

First Aid Actions

  • +P302IF ON SKIN:
  • +P352Wash with plenty of water.
  • +P361Take off immediately all contaminated clothing.
  • +P313Get medical advice/attention.

Related hazard statements:

Eye Contact

Harmful

Measures if substance gets into the eyes

First Aid Actions

  • +P305IF IN EYES:
  • +P351Rinse cautiously with water for several minutes.
  • +P338Remove contact lenses, if present and easy to do. Continue rinsing.
  • +P313Get medical advice/attention.

Related hazard statements:

Ingestion

Toxic

Measures if substance is accidentally swallowed

First Aid Actions

  • +P301IF SWALLOWED:
  • +P330Rinse mouth.
  • +P331Do NOT induce vomiting.
  • +P310Immediately call a POISON CENTER/doctor.

Related hazard statements:

General Measures

Emergency 112 | Poison Control: +49 30 19240 (DE), +33 1 45 42 59 59 (FR), +31 30 274 88 88 (NL)

First aid measures are based on CLP classification and associated P-statements. They do not replace the Safety Data Sheet (SDS). In case of emergency, always consult the full SDS and a physician.

Transport (ADR)

UN Number3087
ADR Class5.1
Packing GroupII
Tunnel CodeE
Proper Shipping NameKaliumdichromat
Marine PollutantNo

Frequently Asked Questions

What is dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium?

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium is potassium dichromate (K₂Cr₂O₇), an inorganic compound with CAS number 7778-50-9. This chromium-based chemical has a molecular weight of 294.18 g/mol and appears as orange-red crystals. It is classified as a highly hazardous substance with carcinogenic, mutagenic, and reproductive toxicity properties, requiring extreme caution in handling and use.

What are the physicochemical properties of dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium?

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium exists as orange-red crystalline solid at room temperature. It is highly soluble in water, forming characteristic orange solutions. The compound is odorless and has strong oxidizing properties due to the hexavalent chromium content. It demonstrates thermal stability under normal conditions but can decompose at high temperatures, releasing toxic chromium compounds and oxygen.

What is dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium used for?

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium serves as a powerful oxidizing agent in analytical chemistry and industrial processes. It is used in chromium plating, leather tanning, wood preservation, and as a laboratory reagent for organic synthesis. The compound also finds applications in photography, pyrotechnics, and as a corrosion inhibitor, though its use is increasingly restricted due to health and environmental concerns.

How to handle dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium safely?

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium requires maximum protection during handling due to its extreme toxicity. Use full respiratory protection, chemical-resistant gloves, and protective clothing. Work in well-ventilated areas or fume hoods to prevent inhalation. Avoid skin contact, ingestion, and dust generation. Implement strict hygiene measures including thorough washing after handling and separate storage of contaminated clothing.

How to store dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium correctly?

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium must be stored in tightly sealed containers in cool, dry, well-ventilated areas away from incompatible materials. As a Class 5.1 oxidizer, keep separated from combustible materials, reducing agents, and organic compounds. Store in original containers with appropriate labeling, ensuring access restriction to authorized personnel only. Maintain temperatures below 25°C and protect from moisture and direct sunlight.

What to do in case of contact with dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium?

Immediate decontamination is critical after contact with dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium. For skin contact, rinse immediately with copious water for at least 15 minutes and remove contaminated clothing. If inhaled, move to fresh air immediately. For eye contact, flush with water for 15-20 minutes. Seek immediate medical attention in all cases, informing healthcare providers of the specific chromium compound involved and potential carcinogenic exposure.

How to dispose of dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium appropriately?

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium must be disposed of as hazardous waste through licensed waste management companies. Never discharge to sewers or environment due to its carcinogenic and environmental toxicity. Reduction to trivalent chromium may be required before disposal in some jurisdictions. Container disposal requires special handling as hazardous waste. Consult local environmental regulations and waste management authorities for specific disposal requirements and approved facilities.

How to transport dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium?

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium is classified as ADR Class 5.1 (oxidizing substances), Packing Group II, indicating significant transport hazards. Use approved packaging meeting UN specifications, with proper hazard labels and documentation. Transport vehicles require appropriate placarding and emergency equipment. Drivers need ADR training certification. Separate from incompatible materials during transport and ensure emergency response information accompanies shipments.

Is dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium subject to specific regulations?

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium is heavily regulated under multiple frameworks including REACH, CLP classification, and workplace safety directives. As a Category 1B carcinogen, mutagen, and reproductive toxicant, it faces strict authorization requirements and use restrictions in many applications. Industrial users must implement risk management measures, worker health surveillance, and comply with emission limits. Some consumer uses are completely prohibited across Europe.

Where to buy dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium in Europe?

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium is available through OYSI, a specialized European distributor of technical chemicals. Due to its hazardous classification and regulatory restrictions, purchase requires verification of legitimate industrial use, appropriate safety measures, and compliance documentation. OYSI provides proper packaging, safety data sheets, and regulatory guidance to ensure compliant handling and use by qualified industrial customers throughout Europe.

Data Sources

Classification per CLP Regulation (EC) No 1272/2008. Data from ECHA and PubChem.