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| CAS No.: | 7789-00-6 |
|---|---|
| Name: | Potassium chromate |
| Molecular Structure: | |
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|
|
| Formula: | CrH2O4.2K |
| Molecular Weight: | 196.20 |
| Synonyms: | Chromicacid (H2CrO4), dipotassium salt (8CI,9CI);Bipotassium chromate;Dipotassiumchromate;Dipotassium chromate (K2CrO4;Dipotassium chromate(2-);Dipotassiummonochromate;Neutral potassium chromate;Potassium chromate;Potassiumchromate (K2(CrO4));Potassium chromate(VI); |
| EINECS: | 232-140-5 |
| Density: | 2.732 g/cm3 |
| Melting Point: | 971 °C(lit.) |
| Solubility: | 640 g/L (20 °C) in water |
| Appearance: | lemon-yellow crystal |
| Hazard Symbols: |
 T,  N,  O
|
| Risk Codes: | 49-46-43-51/53-8-50/53-36/37/38-22-45-52/53 |
| Safety: | 53-45-60-61-36/37-26 |
| Transport Information: | UN 3288 6.1/PG 3 |
| PSA: | 80.26000 |
| LogP: | -0.47520 |
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Standards and Recommendations
OSHA PEL: CL 0.1 mg(CrO3)/m3
ACGIH TLV: TWA 0.05 mg(Cr)/m3; Confirmed Human Carcinogen
Analytical Methods
Neutralization process: Make potassium dichromate dissolved in water and mother solution, and then supplement directly into reactor, neutralize with additive potassium hydroxide while stirring. Then generate potassium chromate which is alkalescent. At last crank out potassium chromate products via evaporation crystallization, concentration, cooling, drying, solid-liquid separation. K2Cr2O7+2KOH→2K2CrO4+H2O
Specification
The Potassium chromate(VI) with CAS registry number of 7789-00-6 is also known as Chromic acid, dipotassium salt. The IUPAC name is Dipotassium dioxido(dioxo)chromium. It belongs to product categories of Inorganics; By Reference Material; N - RVolumetric Solutions; Reference Material Sodium thiosolfate; Salt Solutions; Volumetric Solutions; Metal and Ceramic Science; Potassium Salts; Salts; CHCosmetics; Allergens; Anionic SolutionsChromatography; Anionic Standard SolutionsAlphabetic; Application CRMs; C; Ion Chromatography; Ion Chromatography Standards; Metals; Analytical Reagents for General Use; O-P, Puriss p.a. ACS; Puriss p.a. ACS; Synthetic Reagents; ACS GradeSynthetic Reagents; Essential Chemicals; Inorganic Salts; Potassium; Routine Reagents. Its EINECS registry number is 232-140-5. In addition, the formula is CrH2O4.2K and the molecular weight is 196.20. This chemical is a lemon-yellow crystal and should be sealed in ventilated, cool place away from heat and fire. What's more, it is used as analytical reagent, oxidant, mordant and metal rust inhibitor.
Physical properties about Potassium chromate(VI) are: (1)#H bond acceptors: 4; (2)#H bond donors: 2; (3)Exact Mass: 193.847584; (4)MonoIsotopic Mass: 193.847584; (5)Topological Polar Surface Area: 80.3; (6)Heavy Atom Count: 7; (7)Complexity: 62.2; (8)Covalently-Bonded Unit Count: 3.
Preparation of Potassium chromate(VI): it is prepared by reaction of potassium dichromate with potassium hydroxide. The reaction occurs in mother liquor and water solution under stirring. Product is obtained by evaporation, cooling, crystallization, solid-liquid separation and drying.
K2Cr2O7+2KOH→2K2CrO4+H2O
When you are using this chemical, please be cautious about it. As a chemical, it is harmful if swallowed and toxic to aquatic organisms. When contacting with combustible material, it may cause fire. It is very toxic to aquatic organisms that may cause long-term adverse effects in the aquatic environment. It may cause cancer by inhalation and may cause heritable genetic damage. During using it, wear suitable protective clothing and gloves. If contact with eyes accidently, rinse immediately with plenty of water and seek medical advice. In case of accident or if you feel unwell seek medical advice immediately. This material and its container must be disposed of as hazardous waste.
You can still convert the following datas into molecular structure:
1. Canonical SMILES: [O-][Cr](=O)(=O)[O-].[K+].[K+]
2. InChI: InChI=1S/Cr.2K.4O/q;2*+1;;;2*-1
3. InChIKey: XMXNVYPJWBTAHN-UHFFFAOYSA-N
The toxicity data is as follows:
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| dog | LDLo | intravenous | 2900ug/kg (2.9mg/kg) | Environmental Quality and Safety, Supplement. Vol. 1, Pg. 1, 1975. | |
| dog | LDLo | subcutaneous | 19mg/kg (19mg/kg) | BEHAVIORAL: MUSCLE WEAKNESS GASTROINTESTINAL: NAUSEA OR VOMITING | Scottish Medical and Surgical Journal. Vol. 26, Pg. 131, 1826. |
| guinea pig | LDLo | subcutaneous | 60mg/kg (60mg/kg) | Environmental Quality and Safety, Supplement. Vol. 1, Pg. 1, 1975. | |
| mouse | LD50 | intraperitoneal | 32mg/kg (32mg/kg) | Mutation Research. Vol. 223, Pg. 403, 1989. | |
| mouse | LD50 | oral | 180mg/kg (180mg/kg) | Mutation Research. Vol. 223, Pg. 403, 1989. | |
| rabbit | LD50 | intramuscular | 11mg/kg (11mg/kg) | BEHAVIORAL: FOOD INTAKE (ANIMAL) BEHAVIORAL: COMA | Journal of Pharmacology and Experimental Therapeutics. Vol. 87, Pg. 119, 1946. |
| rabbit | LDLo | subcutaneous | 12mg/kg (12mg/kg) | Environmental Quality and Safety, Supplement. Vol. 1, Pg. 1, 1975. |