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| CAS No.: | 7783-08-6 |
|---|---|
| Name: | Selenic acid |
| Article Data: | 138 |
| Cas Database | |
| Molecular Structure: | |
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|
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| Formula: | H2O4 Se |
| Molecular Weight: | 144.973 |
| Synonyms: | 7783-08-6 |
| EINECS: | 231-979-4 |
| Density: | 1.407g/mLat 25°C |
| Melting Point: | 50 C |
| Boiling Point: | 260 C |
| Flash Point: | >230°F |
| Solubility: | N/A |
| Appearance: | colourless or white crystals |
| Hazard Symbols: |
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| Risk Codes: | R23/24/25;R34 |
| Safety: | Selenium compounds are poisons. A corrosive irritant to skin, eyes, and mucous membranes. When heated to decomposition it emits toxic fumes of Se. See also SELENIUM COMPOUNDS. |
| Transport Information: | UN 3264 |
| PSA: | 74.60000 |
| LogP: | -0.97200 |
| Conditions | Yield |
|---|---|
| In water byproducts: BaSO4; heating of BaSeO4, H2SO4 and H2O in a crucible for about 2.5 h;; | 85% |
| In water byproducts: BaSO4; heating;; | |
| In water |
| Conditions | Yield |
|---|---|
| In nitromethane dry air atm.; -20-30°C, 2 d - 6 weeks; | A 51% B n/a C n/a |
| Conditions | Yield |
|---|---|
| In water | |
| In water |
selenic acid
| Conditions | Yield |
|---|---|
| With bromine In water oxidation of Ag2SeO3 with Br2;; | >99 |
| With bromine In water byproducts: AgBr; addn. of Br2 to a suspension of Ag2SeO3 in H2O under vigorous stirring; passing of a stream of air through the soln. after 2 h;; filtration; passing of air through the filtrate; addn. of HBr; addn. of aq. Br2; filtration; successive concn. of the filtrate in air and in vac.;; | |
| With bromine In water byproducts: AgBr; |
| Conditions | Yield |
|---|---|
| With bromine In water byproducts: AgBr; treatment of a suspension of Ag2SeO3 in H2O with Br2;; | |
| With Br2 In water byproducts: AgBr; treatment of a suspension of Ag2SeO3 in H2O with Br2;; |
| Conditions | Yield |
|---|---|
| In water | A 0% B n/a |
| In water | A 0% B n/a |
| Conditions | Yield |
|---|---|
| In water reaction of ozone and Se in presence of H2O;; | A 0% B n/a |
| In water |
| Conditions | Yield |
|---|---|
| With lead(II) nitrate In neat (no solvent) byproducts: PbS; melting of clausthalite and KNO3; dissolving of the melt in HNO3; boiling; addn. of Pb(NO3)2; decompn. of the formed PbSeO4 with H2S;; | |
| With Pb(NO3)2 In neat (no solvent) byproducts: PbS; melting of clausthalite and KNO3; dissolving of the melt in HNO3; boiling; addn. of Pb(NO3)2; decompn. of the formed PbSeO4 with H2S;; | |
| With Pb(NO3)2 |
| Conditions | Yield |
|---|---|
| In water | |
| In water |
selenic acid
| Conditions | Yield |
|---|---|
| In not given Electrolysis; |
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Selenic acid is a stronger oxidiser than sulfuric acid, capable of liberating chlorine from chloride ions, being reduced to selenous acid in the process:
The MW of Selenic acid (CAS NO.7783-08-6) is 144.97.
Synonyms of Selenic acid (CAS NO.7783-08-6): Selenicacid, 40% solution
Product Categories: Acids;Electronic Chemicals;Micro/Nanoelectronics
Stability: Stable, but decomposes on heating. Non-flammable. Incompatible with metals, combustible materials. Hygroscopic
Apperance: colourless or white crystals
Melting Point: 58 °C
Boiling Point: 260 °C
Density: 1.407 g/mL at 25 °C
Refractive index: n20/D 1.5174
Flash Point: >230 °C
Merck: 14,8429
EINECS: 231-979-4
Selenic acid (CAS NO.7783-08-6) is used as analytical reagent,also for the preparation of selenium salts.
Due to the instability of selenium trioxide, it is impractical to synthesize selenic acid by dissolving selenium trioxide in water, unlike sulfuric acid, which can be synthesized by dissolving sulfur trioxide in water. Instead, it must be prepared by oxidising selenium compounds in lower oxidation states.
One method of preparing selenic acid is by the oxidation of selenium dioxide with hydrogen peroxide:
Selenium and its compounds are on the Community Right-To-Know List. EPA Genetic Toxicology Program. Reported in EPA TSCA Inventory.
Selenium compounds are poisons. A corrosive irritant to skin, eyes, and mucous membranes. When heated to decomposition it emits toxic fumes of Se. See also SELENIUM COMPOUNDS.Safety information of Selenic acid (CAS NO.7783-08-6):
Hazard Codes T,
N
Risk Statements
23/24/25 Toxic by inhalation, in contact with skin and if swallowed
34 Causes burns
50/53 Very Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
33 Danger of cumulative effects
Safety Statements
23 Do not breathe gas/fumes/vapor/spray (appropriate wording to be specified by the manufacturer)
26 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36/37/39 Wear suitable protective clothing, gloves and eye/face protection
45 In case of accident or if you feel unwell, seek medical advice immediately (show label where possible)
61 Avoid release to the environment. Refer to special instructions safety data sheet
60 This material and/or its container must be disposed of as hazardous waste
28 After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer)
20/21 When using, do not eat, drink or smoke
RIDADR UN 3264 8/PG 1
RTECS VS6575000
HazardClass 8
PackingGroup I
OSHA PEL: TWA 0.2 mg(Se)/m3
ACGIH TLV: TWA 0.2 mg(Se)/m3
DFG MAK: 0.1 mg(Se)/m3
DOT Classification: 8; Label: Corrosive
Selenic acid is the chemical compound with the formula H2SeO4. It is an oxoacid of selenium, and its structure is more accurately described as (HO)2SeO2.
As predicted by VSEPR theory, the selenium center is tetrahedral, with a Se–O bond length of 161 pm. In the solid state, it crystallizes in an orthorhombic structure.
