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Selenic acid

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Name

Selenic acid

EINECS 231-979-4
CAS No. 7783-08-6 Density 1.407g/mLat 25°C
PSA 74.60000 LogP -0.97200
Solubility N/A Melting Point 50 C
Formula H2O4 Se Boiling Point 260 C
Molecular Weight 144.973 Flash Point >230°F
Transport Information UN 3264 Appearance colourless or white crystals
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. Risk Codes R23/24/25;R34   
Molecular Structure Molecular Structure of 7783-08-6 (Selenic(VI) acid) Hazard Symbols
Synonyms

7783-08-6

Article Data 138

Selenic acid Synthetic route

barium selenate

7664-93-9

sulfuric acid

7783-08-6

selenic acid

Conditions
ConditionsYield
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

O12Se4, S4-modification

A

Se3O7

B

2NO(1+)*Se3O10(2-)=(NO)2Se3O10

C

7783-08-6

selenic acid

Conditions
ConditionsYield
In nitromethane dry air atm.; -20-30°C, 2 d - 6 weeks;A 51%
B n/a
C n/a
13768-86-0

selenium trioxide

7783-08-6

selenic acid

Conditions
ConditionsYield
In water
In water

silver selenite

7783-08-6

selenic acid

Conditions
ConditionsYield
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;

silver selenite

7783-08-6

selenic acid

Conditions
ConditionsYield
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;;
7782-49-2

selenium

A

7783-00-8

selenious acid

B

7783-08-6

selenic acid

Conditions
ConditionsYield
In waterA 0%
B n/a
In waterA 0%
B n/a
7782-49-2

selenium

A

7783-00-8

selenious acid

B

7783-08-6

selenic acid

Conditions
ConditionsYield
In water reaction of ozone and Se in presence of H2O;;A 0%
B n/a
In water

clausthalite

7783-06-4

hydrogen sulfide

potassium nitrate

7783-08-6

selenic acid

Conditions
ConditionsYield
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
7782-49-2

selenium

7782-50-5

chlorine

A

7783-00-8

selenious acid

B

7783-08-6

selenic acid

Conditions
ConditionsYield
In water
In water

copper(II) selenate

7783-08-6

selenic acid

Conditions
ConditionsYield
In not given Electrolysis;

Selenic acid Chemical Properties

Selenic acid is a stronger oxidiser than sulfuric acid, capable of liberating chlorine from chloride ions, being reduced to selenous acid in the process:

H2SeO4 + 2 H+ + 2 ClH2SeO3 + H2O + Cl2
It decomposes above 200°C, liberating oxygen gas and being reduced to selenous acid:
         2 H2SeO4 → 2 H2SeO3 + O2
IUPAC Name: Selenic acid
The MF of Selenic acid (CAS NO.7783-08-6) is H2O4Se.

                             
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 Uses

 Selenic acid (CAS NO.7783-08-6) is used as analytical reagent,also for the preparation of selenium salts.

Selenic acid Production

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:

SeO2 + H2O2H2SeO4
To obtain the anhydrous acid as a crystalline solid, the resulting solution is evaporated at temperatures below 140 °C (413 K; 284 °F) in a vacuum.
Selenic acid may also be prepared by the oxidation of selenous acid (H2SeO3) with halogens, such as chlorine or bromine, or with potassium permanganate. However, using chlorine or bromine as the oxidising agent also produces hydrochloric or hydrobromic acid as a side-product, which needs to be removed from the solution since they can reduce the selenic acid to selenous acid.
Another method of preparing selenic acid is by the oxidation of elemental selenium in water suspension by chlorine:
         Se + 4 H2O + 3 Cl2H2SeO4 + 6 HCl

 

Selenic acid Consensus Reports

Selenium and its compounds are on the Community Right-To-Know List. EPA Genetic Toxicology Program. Reported in EPA TSCA Inventory.

Selenic acid Safety Profile

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  ToxicT,DangerousN
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

Selenic acid Standards and Recommendations

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 Specification

 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.

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