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| CAS No.: | 7738-94-5 |
|---|---|
| Name: | Chromic acid |
| Article Data: | 90 |
| Molecular Structure: | |
|
|
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| Formula: | CrH2O4 |
| Molecular Weight: | 118.009 |
| Synonyms: | Chromic(VI)acid;Chromium hydroxide oxide (Cr(OH)2O2); |
| EINECS: | 231-801-5 |
| Density: | 2.290 |
| Melting Point: | 196 °C (dec.)(lit.) |
| Boiling Point: | 330oC |
| Flash Point: | 250oC |
| Solubility: | highly soluble in water |
| Appearance: | dark purplish red solid |
| Transport Information: | UN 1463/1755 |
| PSA: | 74.60000 |
| LogP: | -0.59120 |
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- 7738-94-5
chromic acid
| Conditions | Yield |
|---|---|
| With sodium plumbate In water soln. of sodium plumbate hydrolyzed at 70-80°C, washed and cooked with Cr2(SO4)3; | 93.4% |
| With sodium hydroxide; oxygen; 1-anthraquinonesulfonic acid; pyrographite In not given Irradiation (UV/VIS); 0.5% antrachinon-α-sulfonic acid and 10% coal containing absorption catalyst, in O2 atm., daylight, quant. oxidn.; | >99 |
| Conditions | Yield |
|---|---|
| at 5 - 35℃; for 0.416667 - 0.5h; |
- 7738-94-5
chromic acid
| Conditions | Yield |
|---|---|
| With sulfuric acid In water | |
| With sulfuric acid In sulfuric acid | |
| With H2SO4 In sulfuric acid aq. H2SO4; |
| Conditions | Yield |
|---|---|
| In water oxide dissoln.; | |
| With sulfuric acid |
- 7738-94-5
chromic acid
| Conditions | Yield |
|---|---|
| With AuO(OH) In water heating;; | |
| With dipotassium peroxodisulfate In water in presence of AgNO3 in acidic soln.;; | |
| With sodium chlorate In water prolonged boiling in presence of K3(Fe(CN)6);; |
| Conditions | Yield |
|---|---|
| With air In neat (no solvent) Cr2O3 placed in quartz boat, vaporized in humid air at 1223 K (pH2O=0.1 bar); |
| Conditions | Yield |
|---|---|
| In neat (no solvent) |
- 7738-94-5
chromic acid
| Conditions | Yield |
|---|---|
| With H2O In water hydrolysis;; |
- 7738-94-5
chromic acid
| Conditions | Yield |
|---|---|
| With sulfuric acid byproducts: O2; 100-120°C, formn. of O2 only at 120°C; | |
| With concd. H2SO4 byproducts: O2; 100-120°C, formn. of O2 only at 120°C; |
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Chemistry
Molecule structure of Chromic acid (CAS NO.7738-94-5):
IUPAC Name: Dihydroxy(dioxo)chromium
Molecular Weight: 118.00958 g/mol
Molecular Formula: CrH2O4
Water Solubility: highly soluble
H-Bond Donor: 2
H-Bond Acceptor: 4
Exact Mass: 117.93582
MonoIsotopic Mass: 117.93582
Topological Polar Surface Area: 74.6
Heavy Atom Count: 5
Canonical SMILES: O[Cr](=O)(=O)O
InChI: InChI=1S/Cr.2H2O.2O/h;2*1H2;;/q+2;;;;/p-2
InChIKey: KRVSOGSZCMJSLX-UHFFFAOYSA-L
EINECS: 231-801-5
Classification Code: Mutation data; TSCA Flag R [Subject to a Section 6 risk management rule under TSCA]
Uses
Chromic acid is an intermediate in chromium plating, and is also used in ceramic glazes, and colored glass. It can be used to clean laboratory glassware, because a solution of chromic acid in sulfuric acid (also known as a sulfochromic mixture) is a powerful oxidizing agent.
Toxicity Data With Reference
| 1. | mmo-sat 80 µg/plate | MUREAV Mutation Research. 54 (1978),139. | ||
| 2. | dnr-smc 1200 nmol/L | CNJGA8 Canadian Journal of Genetics and Cytology. 24 (1982),771. | ||
| 3. | dnr-ssp 1200 nmol/L | CNJGA8 Canadian Journal of Genetics and Cytology. 24 (1982),771. | ||
| 4. | scu-dog LDLo:320 mg/kg | EQSSDX Environmental Quality and Safety, Supplement. 1 (1975),1. |
Consensus Reports
Reported in EPA TSCA Inventory. Chromium and its compounds are on the Community Right-To-Know List.
Safety Profile
RIDADR: UN 1463/1755
Confirmed human carcinogen. Poison by subcutaneous route. Mutation data reported. A powerful oxidizer. A powerful irritant of skin, eyes, and mucous membranes. Can cause a dermatitis, bronchoasthma, “chrome holes,” damage to the eyes. Dangerously reactive. Incompatible with acetic acid, acetic anhydride, tetrahydronaphthalene, acetone, alcohols, alkali metals, ammonia, arsenic, bromine penta fluoride, butyric acid, n,n-dimethylformamide, hydrogen sulfide, peroxyformic acid, phosphorus, potassium hexacyanoferrate, pyridine, selenium, sodium, sulfur, and many other materials. See also CHROMIUM COMPOUNDS.
Standards and Recommendations
OSHA PEL: CL 0.1 mg(CrO3)/m3
ACGIH TLV: TWA 0.05 mg(Cr)/m3, Confirmed Human Carcinogen
DFG MAK: Animal Carcinogen, Suspected Human Carcinogen
NIOSH REL: (Chromium(VI)) TWA 0.025 mg(Cr(VI))/m3; CL 0.05/15M
Analytical Methods
For occupational chemical analysis use NIOSH: Chromium Hexavalent 7024.
Specification
Chromic acid (CAS NO.7738-94-5) is also named as AI3-51760 ; Acide chromique ; Acide chromique [French] ; CCRIS 8994 ; Caswell No. 221 ; Chromic(VI) acid ; Chromium hydroxide oxide ; EPA Pesticide Chemical Code 021101 ; HSDB 6769 . Chromic acid (CAS NO.7738-94-5) is a dark purplish red solid. It is soluble in water with the release of heat.Chromic acid itself is noncombustible but it will accelerate the burning of combustible materials. Its solution is corrosive to metals and tissue. It is a very powerful oxidizing agent, confirmed human carcinogen. Dangerously reactive with acetone, alcohols, alkali metals (sodium, potassium), ammonia, arsenic, dimethylformamide, hydrogen sulfide, phosphorus, peroxyformic acid, pyridine, selenium, sulfur, and many other chemicals. Chromic acid can cause a violent explosion, in contact with organic matter. It may cause a violent oxidation leading to ignition. When mixed with sulfuric acid for glass cleaning operations, used solution in closed bottle may explode due to internal pressure of carbon dioxide arising from contamination by carbon compounds. Very irritating to eyes and respiratory tract. Ingestion causes severe gastrointestinal symptoms.