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

Cr2K2O7

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

CAS7778-50-9
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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 highly toxic chromium(VI) compound with strong oxidizing properties and carcinogenic potential. This orange-red crystalline compound, with the molecular formula Cr2K2O7 and molecular weight of 294.18 g/mol, represents one of the most widely recognized hexavalent chromium compounds in industrial applications. Also known by its common name potassium dichromate, this substance exhibits exceptional oxidizing capabilities while presenting significant health and environmental hazards that require careful handling protocols. The compound's classification under multiple GHS hazard categories reflects its complex risk profile. As an Oxidizing Solid 2, it can intensify fires and cause combustible materials to ignite. More critically, its designation as Carcinogenic 1B, Mutagenic 1B, and Reproductive Toxicant 1B underscores the severe health risks associated with exposure. The substance also presents acute toxicity concerns across multiple exposure routes, necessitating comprehensive safety measures during handling, storage, and transport under ADR Class 5.1 regulations. Despite these hazards, the compound maintains important industrial applications due to its powerful oxidizing characteristics. It serves as a critical component in leather tanning processes, where its chromium content facilitates the conversion of raw hides into durable leather products. The compound also functions as an essential reagent in analytical chemistry laboratories for various oxidation reactions and serves as an intermediate in the production of other chromium compounds. Like its sodium analog disodium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium, it plays a role in specialized industrial processes requiring controlled oxidation conditions. OYSI maintains availability of this regulated compound for qualified industrial customers with appropriate handling capabilities and regulatory compliance frameworks.

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, a powerful inorganic oxidizing agent with the chemical formula Cr2K2O7. This chromium-based compound has a molecular weight of 294.18 g/mol and appears as orange-red crystalline solid. It is classified as extremely hazardous due to its carcinogenic, mutagenic, and reproductive toxic properties, requiring strict safety protocols during 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 bright 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 hexavalent chromium. It demonstrates thermal stability under normal conditions but decomposes at high temperatures, releasing toxic chromium oxide vapors.

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 laboratory applications for oxidation reactions, in the production of chromium compounds, and in certain electroplating processes. Due to its extreme toxicity and regulatory restrictions, its industrial applications have been significantly reduced, with safer alternatives preferred where possible.

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

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium requires maximum safety precautions due to its carcinogenic and toxic properties. Essential PPE includes nitrile gloves, safety goggles, respiratory protection, and protective clothing. Work must be conducted in well-ventilated areas or fume hoods. Avoid skin contact, inhalation, and ingestion completely. Emergency eyewash and shower facilities must be readily accessible during handling operations.

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 heat sources and incompatible materials. Keep separate from reducing agents, organic materials, acids, and flammable substances. Storage areas should be secure with restricted access due to the substance's carcinogenic properties. Containers must be properly labeled with appropriate hazard warnings.

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

Immediate decontamination is critical following contact with dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium. For skin contact, rinse immediately with copious amounts of water for at least 15 minutes. If inhaled, move to fresh air immediately. For eye contact, flush with water for 15 minutes. Remove contaminated clothing. Seek immediate medical attention in all cases, informing medical personnel of the substance's carcinogenic properties.

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 specializing in chromium compounds. Never discharge into drains, soil, or water bodies due to severe environmental toxicity. The substance requires specialized treatment processes to reduce hexavalent chromium to less toxic trivalent forms before final disposal, following all local and EU waste regulations.

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 substance), Packing Group II, indicating significant transport hazards. Transportation requires UN-approved packaging, proper labeling with oxidizing and toxic hazard symbols, and appropriate shipping documentation. Only authorized carriers with hazardous materials certification can transport this substance, following strict ADR regulations for oxidizing materials.

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

Dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium is heavily regulated under EU REACH and CLP regulations due to its carcinogenic, mutagenic, and reproductive toxic properties. It requires authorization for most uses under REACH Annex XIV. The substance is subject to workplace exposure limits, mandatory risk assessments, and restricted use conditions. Companies must implement strict occupational health measures and maintain detailed exposure records.

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 strict regulatory requirements for this carcinogenic substance, purchases require proper authorization, safety documentation, and compliance verification. OYSI provides technical support and ensures regulatory compliance for customers requiring this hazardous oxidizing agent for legitimate industrial or research applications across Europe.

Data Sources

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