C

Chromium(VI) oxide

IUPAC: trioxochromium

CrO3 Inorganic Compounds CAS 1333-82-0
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Quick Reference
Formula / NotationCrO3
CAS Number1333-82-0
Molecular Weight99.994
Melting Point385 °F (NTP, 1992)
Boiling Point482 °F at 760 mmHg (decomposes) (NTP, 1992)
Density2.7 (NTP, 1992) - Denser than water; will sink
SolubilityVery soluble (NTP, 1992)
AppearanceChromium trioxide, anhydrous appears as a dark purplish red solid. Under prolonged exposure to fire or heat the containers may explode. Highly toxic. A confirmed human carcinogen.
Also Known Astrioxochromium; Chromium trioxide; Chromic anhydride; CrO3; Chromtrioxid; Monochromium trioxide; CHROMIC TRIOXIDE; Chromsaeureanhydrid; Anhydride chromique; Chromium(6+) oxide
CategoryInorganic Compounds

What is Chromium(VI) oxide?

Chromium trioxide is a chromium oxide composed of a single chromium bound (oxidation state +6) to three oxygens; the acidic anhydride of chromic acid.

Formula & Notation

CrO3

IUPAC Name: trioxochromium

Other Names / Synonyms: trioxochromium; Chromium trioxide; Chromic anhydride; CrO3; Chromtrioxid; Monochromium trioxide; CHROMIC TRIOXIDE; Chromsaeureanhydrid; Anhydride chromique; Chromium(6+) oxide

Properties & Characteristics

Appearance: Chromium trioxide, anhydrous appears as a dark purplish red solid. Under prolonged exposure to fire or heat the containers may explode. Highly toxic. A confirmed human carcinogen.. Molecular formula: CrO3. Molecular weight: 99.994 g/mol. Boiling point: 482 °F at 760 mmHg (decomposes) (NTP, 1992). Melting point: 385 °F (NTP, 1992). Density: 2.7 (NTP, 1992) - Denser than water; will sink. Solubility: Very soluble (NTP, 1992). Vapor pressure: Very low (NIOSH, 2024).

Physical Data

PropertyValue
Melting Point385 °F (NTP, 1992)
Boiling Point482 °F at 760 mmHg (decomposes) (NTP, 1992)
Density2.7 (NTP, 1992) - Denser than water; will sink
Molecular Weight99.994
SolubilityVery soluble (NTP, 1992)
AppearanceChromium trioxide, anhydrous appears as a dark purplish red solid. Under prolonged exposure to fire or heat the containers may explode. Highly toxic. A confirmed human carcinogen.

Uses & Applications

Used in industrial processes, materials science, semiconductor manufacture, ceramics, or as a catalyst.

Safety Information

May be corrosive, toxic, or an oxidising agent. Handle in well-ventilated area. Consult SDS before use.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Chromium(VI) oxide
Formula CrO3
CAS Number 1333-82-0
Molecular Weight 99.994
Category Inorganic Compounds
Index All "C" terms
Synonyms trioxochromium; Chromium trioxide; Chromic anhydride; CrO3; Chromtrioxid; Monochromium trioxide; CHROMIC TRIOXIDE; Chromsaeureanhydrid; Anhydride chromique; Chromium(6+) oxide

Frequently Asked Questions

Chromium trioxide is a chromium oxide composed of a single chromium bound (oxidation state +6) to three oxygens; the acidic anhydride of chromic acid.

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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.

AllChemicals.info — The Online Chemical Glossary | https://allchemicals.info/chemical/chromium-vi-oxide

For educational purposes only. Verify all information before use.