Potassium dichromate
CAS 7778-50-9Cr2K2O7294.18 g/mol
Potassium dichromate is a potassium salt that is the dipotassium salt of dichromic acid. It has a role as a sensitiser, an allergen and an oxidising agent. It contains a dichromate(2-).
IUPAC: dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium
PubChem
Physical & Chemical Properties
| Melting Point | 748 °F (NTP, 1992) |
| Boiling Point | Decomposes at 932 °F (NTP, 1992) |
| Density | 2.676 at 77 °F (USCG, 1999) - Denser than water; will sink |
| Solubility | 10 to 50 mg/mL at 68 °F (NTP, 1992) |
| pH | Acid reaction: a 1% aqueous solution has pH of 4.04 and a 10% solution has a pH of 3.57 |
| Appearance | Potassium bichromate appears as orange red crystals. Denser than water and soluble in water. No distinctive odor. May severely irritate the eyes and respiratory tract. Avoid contact with organic materials. Noncombustible. Used in pyrotehnic displays with tungsten and iron. |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 2841
Data: UN Comtrade
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