Chromium(VI) oxide
Chromium(VI) oxide
CAS: 1333-82-0
Molecular Formula: CrO3
Chromium(VI) oxide - Names and Identifiers
Chromium(VI) oxide - Physico-chemical Properties
| Molecular Formula | CrO3 |
| Molar Mass | 99.9943 |
| Melting Point | 196℃ |
| Water Solubility | 1660 g/L (20℃) |
| Physical and Chemical Properties | Dark red orthorhombic crystal or purple-red flake. melting point 196 ℃ freezing point 170~172 ℃ relative density 2.7 solubility soluble in water, alcohol, sulfuric acid and ether, insoluble in acetone. |
| Use | Used for electroplating, making high purity metal chromium, dyes, synthetic rubber and grease refining |
Chromium(VI) oxide - Risk and Safety
| Hazard Symbols | O - Oxidizing agent T+ - Very toxic  N - Dangerous for the environment  |
| Risk Codes | R26 - Very Toxic by inhalation R35 - Causes severe burns R42/43 - May cause sensitization by inhalation and skin contact. R45 - May cause cancer R46 - May cause heritable genetic damage R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R62 - Possible risk of impaired fertility R9 - Explosive when mixed with combustible material |
| Safety Description | S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S53 - Avoid exposure - obtain special instructions before use. S60 - This material and its container must be disposed of as hazardous waste. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 1463 |
Chromium(VI) oxide - Upstream Downstream Industry
| Raw Materials | Sodium carbonate Sulfuric acid Lead (II) sulfate Sodium Dichromate |
| Downstream Products | Potassium dichromate Ammonium dichromate Ammonium chromate Chromium(VI) oxide 2-Methyl-1,4-naphthoquinone |
Chromium(VI) oxide - Nature
Open Data Verified Data
dark red bicrystal prism crystal or thin, granular, powder. Deliquescence. Soluble in water, soluble in ethanol, ether, nitric acid, sulfuric acid. Melting Point: 197 ℃; Relative density: 2. 70. 250 deg C for the decomposition of chromium oxide and oxygen. Contact with combustibles and combustibles can cause severe reactions and even combustion. Strong oxidant. After mixing with reducing substances such as magnesium powder, aluminum powder, sulfur, phosphorus and the like, it can cause combustion or explosion through friction or impact. It has strong corrosion.
Last Update：2024-01-02 23:10:35
Chromium(VI) oxide - Preparation Method
Open Data Verified Data
The preparation of chromic anhydride includes sulfuric acid method, nitric acid method, fluosilicic acid method and electrolysis method. The sulfuric acid method is mainly used in industry. Anhydrous sodium dichromate and sulfuric acid were mixed in a reaction kettle, and then heated to 200 ° C. For melting reaction to obtain molten products of chromic anhydride and sodium hydrogen sulfate, which were allowed to stand and layered and then cooled.
Last Update：2022-01-01 09:00:00
Chromium(VI) oxide - Use
Open Data Verified Data
An important chromium compound, chromic anhydride is the main raw material for electroplating industry, used as the main raw material for chromium plating. Most of the chromic anhydride is consumed in the electroplating industry. Chromic anhydride is a good oxidant, can be used for bleaching, refining, can also be used as raw materials for dyes, mordant, tanning agent and organic synthesis reaction catalyst. In addition, it is also used in medicine, ceramics, colored glass and other industries.
Last Update：2022-01-01 09:00:01
Chromium(VI) oxide - Safety
Open Data Verified Data
IARC carcinogenicity comment: human carcinogens are well documented in humans and animals. The maximum allowable concentration in air is 0. 05 mg.1_11-3. In the storage and transportation must be sealed packaging, and pay attention to heat, anti-shock. It is not allowed to mix with organic matter, and it should be protected during operation.
Last Update：2022-01-01 09:00:01
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View History
Raw Materials for Chromium(VI) oxide
Downstream Products for Chromium(VI) oxide
Potassium dichromate
Ammonium dichromate
Ammonium chromate
Chromium(VI) oxide
2-Methyl-1,4-naphthoquinone
Ammonium dichromate
Ammonium chromate
Chromium(VI) oxide
2-Methyl-1,4-naphthoquinone