chromium trihydrate
dichromium trioxide hydrate
CAS: 1308-14-1
Molecular Formula: CrH5O4
chromium trihydrate - Names and Identifiers
chromium trihydrate - Physico-chemical Properties
| Molecular Formula | CrH5O4 |
| Molar Mass | 103.18 |
| Boling Point | 100°C at 760 mmHg |
| Water Solubility | insoluble H2O; soluble dilute mineral acids when freshly prepared [MER06] |
| Vapor Presure | 24.5mmHg at 25°C |
| Appearance | Morphological blue-green powder |
| PH | 7.04(1 mM solution);7.04(10 mM solution);7.04(100 mM solution) |
| Storage Condition | Room Temprature |
| Physical and Chemical Properties | The nature of gray blue or gray green solid or powder is easy to decompose when heated. It starts to decompose into chromium trioxide at 400 ℃ and completely decomposes into chromium oxide green at 500 ℃. It is colloidal when precipitated in aqueous solution. Insoluble in water, soluble in acid during initial precipitation, but insoluble after a long time. It is soluble in caustic and becomes chromite, so it has two properties like aluminum hydroxide. |
| Use | For the preparation of Chromium pigments and chromium salts |
chromium trihydrate - Upstream Downstream Industry
chromium trihydrate - Nature
Open Data Verified Data
gray-green or gray-sky blue no qualitative powder. Insoluble in water. Ordinary products can be strongly hydrated, and in line with the molecular formula Cr(OH)3-xH20(X 2~4); After placed in concentrated sulfuric acid into two water. Drying at 100 °c turned into anhydrous, dehydration started over 100 °c, and Cr203 (dark green) turned on further ignition. It is an amphoteric hydroxide. Can become extremely weak acid HCr02 [I. E. Cr( OH)3-H2 0]. Its dissociation constant is K-9 x 10-16 at 25. Soluble in alkali to form chromate. Dissolved in inorganic acid to form trivalent chromium salt. Relative density 2.9; Water solubility product (25 ℃)6.3 × 10 -31; Crystal structure (hexagonal): mouth -0. 5288nm, c-0. 4811nm, z-2. Formaldehyde reduction method: the sodium dichromate solution is acidified with sulfuric acid and then reduced with formaldehyde as reducing agent to directly prepare anhydrous chromium hydroxide, and the finished product is obtained by separation, washing and drying.
Last Update：2024-01-02 23:10:35
chromium trihydrate - Preparation Method
Open Data Verified Data
- precipitation method: an aqueous solution of chromium sulfate reacts with aqueous ammonia to form a precipitate of chromium hydroxide. In the reaction kettle, the chromium sulfate (or chromium chloride) solution is heated to near boiling, and ammonia water is slowly added several times, and the amount is higher than the theoretical amount, so that the generated precipitate is easy to filter.
- the suspension was filtered, sufficiently washed, and then dried at 100 ° C. To dry and dehydrate the precipitate (cr20 A. ZH2 0) to form a finished chromium hydroxide product.
- sulfur reduction method: Under alkaline conditions, sodium chromate (solution) is reduced with sulfur in a reaction kettle at 140-160 ° C. To generate chromium hydroxide hydrate precipitate, and the product is obtained by separation, washing, drying and dehydration.
- sodium sulfide reduction method: sodium chromate (aqueous solution) is reduced by sodium sulfide as a reducing agent to generate chromium hydroxide hydrate precipitate, and the product is obtained by separation and washing, drying and dehydration.
- sulfur dioxide reduction method: sulfur dioxide is introduced into the alkaline aqueous solution of sodium chromate to react to generate chromium hydroxide hydrate precipitate. After separation, washing and precipitation, the product is obtained by drying and dehydration.
Last Update：2022-01-01 11:05:31
chromium trihydrate - Use
Open Data Verified Data
for the preparation of trivalent chromium salts and chromium oxide, chemical reagents. Also used in paint, pigment, wool processing and metallurgy, enamel and other industries.
Last Update：2022-01-01 11:05:30
chromium trihydrate - Safety
Open Data Verified Data
packed in woven bags lined with polyethylene plastic bags, 25kg or 50kg per bag.
Last Update：2022-01-01 11:05:31
chromium trihydrate - Uses and synthesis methods
Introduction
chromium hydroxide, also known as chrome blue, is an important inorganic pigment, chromium product synthesis intermediate and chemical raw material. Chromium hydroxide has two forms: crystalline and amorphous. Crystalline chromium hydroxide contains 3 crystal water Cr(OH)3 · 3H2O, which can also be expressed as Cr2O3 · 9H2O. The reagent chromium hydroxide (containing about 50% Cr2O3) represented by Cr(OH)3 · 2H2O is a blue-green colloidal precipitate.
first aid measures
Inhalation: If inhaled, please move the patient to fresh air. Skin contact: Remove contaminated clothing and rinse skin thoroughly with soapy water and clear water. If you feel uncomfortable, see a doctor. Eye clear contact: separate eyelids and rinse with flowing water or normal saline. Medical treatment immediately. Ingestion: gargle, no vomiting. Medical treatment immediately. Advice to the protection of the rescuer: transfer the patient to a safe place. Consult a doctor. Show this chemical safety technical specification to the doctors on site.
category
Toxic substances
Toxicity classification
Highly toxic
Acute toxicity
Oral-Women TDL0: 100 mg/kg
flammability hazard characteristics
Non-combustible; toxic chromium-containing fumes produced by the fire site;
storage and transportation features
The warehouse is low temperature, ventilated and dry; stored separately from food ingredients
Fire extinguishing agent
Water, carbon dioxide, dry powder, sand
occupational standards
TWA 0.05 mg (chromium)/m3
Last Update：2024-04-10 22:41:56
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CAS: 1308-14-1
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View History
Raw Materials for chromium trihydrate
Downstream Products for chromium trihydrate
Chromium(III) oxide
Nickel(II) nitrate hexahydrate
medium temperature Shift catalysts
medium(high)temperature Shift catalysts
Carbon tetrafluoride
Chromium(III) fluoride
Nickel(II) nitrate hexahydrate
medium temperature Shift catalysts
medium(high)temperature Shift catalysts
Carbon tetrafluoride
Chromium(III) fluoride