Selenic acid supplier | CasNO.7783-08-6

Name
Selenic(VI) acid
EINECS 231-979-4
CAS No. 7783-08-6
Article Data138
CAS DataBase
Density 1.407g/mLat 25°C
Solubility
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
Hazard Symbols
Synonyms 7783-08-6
PSA 74.60000
LogP -0.97200

Synthetic route

: barium selenate

: 7664-93-9
sulfuric acid

: 7783-08-6
selenic acid

Conditions

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

: O12Se4, S4-modification

A: Se3O7

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

C: 7783-08-6
selenic acid

Conditions

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

...Expand

: 7732-18-5
water

: 13768-86-0
selenium trioxide

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In water
In water

: silver selenite

: 7783-08-6
selenic acid

Conditions

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;

: silver selenite

: 7732-18-5
water

: 7783-08-6
selenic acid

Conditions

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;;

: 7782-49-2
selenium

: 7732-18-5
water

: 10028-15-6
ozone

A: 7783-00-8
selenious acid

B: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In water	A 0% B n/a
In water	A 0% B n/a

...Expand

: 7782-49-2
selenium

: 10028-15-6
ozone

A: 7783-00-8
selenious acid

B: 7783-08-6
selenic acid

Conditions

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

...Expand

: clausthalite

: 7783-06-4
hydrogen sulfide

: potassium nitrate

: 7783-08-6
selenic acid

Conditions

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

...Expand

: 7782-49-2
selenium

: 7732-18-5
water

: 7782-50-5
chlorine

A: 7783-00-8
selenious acid

B: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In water
In water

...Expand

: copper(II) selenate

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In not given Electrolysis;

: copper(II) selenate

: 7783-06-4
hydrogen sulfide

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In water byproducts: CuS;
In water byproducts: CuSO4, CuS;
In water

: 7446-08-4
selenium(IV) oxide

: 7790-93-4
chloric acid

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In not given
In not given

: 7782-49-2
selenium

: 7790-93-4
chloric acid

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
With nitric acid In water byproducts: Cl2; dissolving of a suspension of Se in H2O by addn. of HNO3; concg.; addn. of HClO3; evapn.; concn. on passing of air through the soln. under reduced pressure; concn. at 150°C under reduced pressure;; diln. with H2O; filtration; concn. in vac.;;	90-95
In not given
With HNO3 In water byproducts: Cl2; dissolving of a suspension of Se in H2O by addn. of HNO3; concg.; addn. of HClO3; evapn.; concn. on passing of air through the soln. under reduced pressure; concn. at 150°C under reduced pressure;; diln. with H2O; filtration; concn. in vac.;;	90-95
In not given

: 7446-08-4
selenium(IV) oxide

: 7697-37-2
nitric acid

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In not given at elevated temp.;;
In not given at elevated temp.;;

: 7446-08-4
selenium(IV) oxide

: 7697-37-2
nitric acid

A: 7783-00-8
selenious acid

B: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In not given	A n/a B 0%
In not given

...Expand

: 7782-49-2
selenium

: 7697-37-2
nitric acid

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In nitric acid formation of small amounts of selenic acid, addition of HCl, avoids formation of selenic acid;;

: 7782-49-2
selenium

: 7697-37-2
nitric acid

A: 7783-00-8
selenious acid

B: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In not given	A n/a B 0%
In not given

...Expand

: lead(II) selenate

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In water Electrolysis; cathode: Pt vessel, anode: Pt spiral, cathodic current density: 0.2 A/dm*dm, ambient temp.;;

: lead(II) selenate

: 7664-93-9
sulfuric acid

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In water incomplete reaction;;

: lead(II) selenate

: 7783-06-4
hydrogen sulfide

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In water byproducts: PbS; introduction of H2S into an aq. soln. of PbSeO4;; filtration; boiling of the filtrate; concn.;;
In water byproducts: PbS;
In water introduction of H2S into a suspension of PbSeO4 in H2O;;

: 7446-08-4
selenium(IV) oxide

: potassium nitrate

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In melt oxidation with melting KNO3;;

: 7446-08-4
selenium(IV) oxide

: 7783-06-4
hydrogen sulfide

: potassium nitrate

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
With lead(II) nitrate In not given melting of SeO2 and KNO3; dissolving of the melt in aq. HNO3; boiling; addition of Pb(NO3)2; decomposition of the formed PbSeO4 with H2S;;
With Pb(NO3)2 In not given melting of SeO2 and KNO3; dissolving of the melt in aq. HNO3; boiling; addition of Pb(NO3)2; decomposition of the formed PbSeO4 with H2S;;
With Pb(NO3)2

...Expand

: 7782-49-2
selenium

: potassium nitrate

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In melt oxidation with melting KNO3;;

: 7446-08-4
selenium(IV) oxide

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
With hydrogen peroxide In water 50°C in O2 atm.; dehydrated with P2O5-dried oxygen stream and a partial vac.;

: 7446-08-4
selenium(IV) oxide

A: 7782-49-2
selenium

B: 7783-08-6
selenic acid

Conditions

Conditions	Yield
With mercury(I) chloride In hydrogenchloride
In hydrogenchloride

: 7446-08-4
selenium(IV) oxide

: 7722-84-1
dihydrogen peroxide

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In water repeated evapn. of SeO2 and an excess of 30% H2O2 in an open vessel;;
In water boiling of SeO2 and 30% H2O2 under reflux for some hours;;
In water repeated evapn. of SeO2 and an excess of 30% H2O2 in an open vessel;;
With O2 In water; dihydrogen peroxide storage of an aq. soln. of SeO2 and H2O2 for 24 hours; boiling for 12 hours under reflux and passing of O2 through the solution;; concn. under reduced pressure;;
In water boiling of SeO2 and 30% H2O2 under reflux for some hours;;

: 7631-99-4
sodium nitrate

: 7446-08-4
selenium(IV) oxide

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In melt oxidation with melting NaNO3;;

: 7783-00-8
selenious acid

A: 7782-49-2
selenium

B: lead(II) selenate

C: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In water Electrolysis; use of Pb-anode;;

...Expand

: 7783-00-8
selenious acid

: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In nitric acid Electrolysis; free of SeO2;;
With bromine In water equilibrium reaction;; not isolated;;
With bromine In water equilibrium reaction;;

: 7783-00-8
selenious acid

A: 7782-49-2
selenium

B: 7783-08-6
selenic acid

Conditions

Conditions	Yield
In water Electrolysis; various conditions;;
In water Electrolysis; use of a diaphragm, mixture of 6% H2SeO4 and 10% Na2SeO4 as catholyte, aq. H2SeO3 as anolythe;;

: 7783-08-6
selenic acid

: 47252-14-2
triphenylbismuth carbonate

: (C6H5)3BiSeO4

Conditions

Conditions	Yield
at 10 °C, with excess of H2SeO4; washing with water and acetone;	100%
with dild. soln. of H2SeO4, mixing, at 10 °C;	100%
at 10 °C, with excess of H2SeO4; washing with water and acetone;	100%
with dild. soln. of H2SeO4, mixing, at 10 °C;	100%

: di-gold(III)bis(selenite)oxide

: 7783-08-6
selenic acid

: 2Au(3+)*Se4O11(6-)=Au2Se4O11

Conditions

Conditions	Yield
compd. is heated with selenic acid in a sealed tube at 553 K (1 wk);	99.9%

: 7783-08-6
selenic acid

: 7440-05-3
palladium

: palladium selenite

Conditions

Conditions	Yield
In neat (no solvent) Pd powder (30 mg) and H2SeO4 (1 ml) sealed in glass ampoule; heated (350°C, 72 h); cooled (3°C/h);	99%

: 7783-08-6
selenic acid

: 7440-05-3
palladium

: palladium (II) selenate

Conditions

Conditions	Yield
In neat (no solvent) Pd powder (15 mg) and H2SeO4 (1 ml) sealed in glass ampoule; heated (350°C, 72 h); cooled (3°C/h);	99%
In further solvent(s) on dissolving Pd sponge in a hot mixture of H2SeO4 and HNO3 and slow cooling down of concd. soln.;; on evaporization of soln. of Pd in H2SeO4, selenate is not obtained without impurity of H2SeO4 or H2SeO3;;
In further solvent(s) on dissolving Pd sponge in a hot mixture of H2SeO4 and HNO3 and slow cooling down of concd. soln.;; on evaporization of soln. of Pd in H2SeO4, selenate is not obtained without impurity of H2SeO4 or H2SeO3;;

: 7783-08-6
selenic acid

: 13768-86-0
selenium trioxide

: 7440-05-3
palladium

: palladium diselenite

Conditions

Conditions	Yield
In neat (no solvent) Pd powder (8 mg) and H2SeO4 (1 ml) and SeO3 (50 mg) sealed in glass ampoule; heated to 250°C; cooled (3°C/h);	99%

...Expand

: 504-24-5
4-aminopyridine

: 7783-08-6
selenic acid

: pyridinium selenate monohydrate

Conditions

Conditions	Yield
at 20℃;	97%

: uranyl nirate hexahydrate

: 7783-08-6
selenic acid

: 109-73-9
N-butylamine

: (butylamineH)14(uranyl)10(selenate)17*H2O

Conditions

Conditions	Yield
In water mixt. of butylamine, H2SeO4 and U compd. in H2O was stirred until complete homogenization; poured into watch glass and evapd. for 6-7 d;	90%

...Expand

: 288-13-1
NH-pyrazole

: 7783-08-6
selenic acid

: molybdenum(VI) oxide

: [pyrazolium]4[(pyrazole)2Mo8O26] * CH3COCH3 * 2 H2O

Conditions

Conditions	Yield
In water refluxing MoO3 and pyrazole with excess H2SeO4; recrystn. (Me2CO diffusion into aq. soln.); elem. anal.;	89%

...Expand

: pentamminechlorochromium(III) dichloride

: 7783-08-6
selenic acid

: selenatopentaamminechromium(III) hydrogenselenate dihydrate

Conditions

Conditions	Yield
In neat (no solvent) byproducts: Cl2; H2SeO4 and Cr-complex were warmed at 70°C for 6 h, soln. was allowed to cool to room temp., MeOH was added; collected, washed with MeOH; elem. anal.;	89%

: 7783-08-6
selenic acid

: silver nitrate

: molybdenum(VI) oxide

: Ag4Mo2O5(SeO4)2(SeO3)

Conditions

Conditions	Yield
In water High Pressure; AgNO3, MoO3, H2SeO4 and H2O placed in autoclave, sealed, heated at 200°C for 3 d, cooled to room temp. at 9°C/h; ppt. washed with H2O and MeOH, dried;	88.8%

...Expand

: 7783-08-6
selenic acid

: 7782-49-2
selenium

Conditions

Conditions	Yield
With sulfuric acid; potassium iodide In sulfuric acid byproducts: I2; sepn. of the formed I2 by distn.;;	87.8%
With sulfuric acid; potassium iodide In sulfuric acid byproducts: I2, H2O; storage at room temperature for 4 weeks;;	38.4%
With sodium hypophosphite In water heating for a longer period of time;;	>99

: neodymium(III) oxide

: 7783-08-6
selenic acid

: potassium hydroxide

: K(1+)*Nd(3+)*2SeO4(2-)=KNd(SeO4)2

Conditions

Conditions	Yield
With Si(OEt)4; HNO3 In water High Pressure; Nd2O3 (1 equiv.) (acidified with HNO3), KOH (2 equiv.) and H2SeO4 (3 equiv.) were mixed in H2O; soln. was stirred for 30 min; Si(OEt)4 was addedgradually; stirred at 353 K; sealed in autoclave; heated at 483 K for 3 d; elem. anal.;	85%

...Expand

: silver selenate

: 7732-18-5
water

: 7783-08-6
selenic acid

: 603-35-0
triphenylphosphine

: 332401-94-2
[Ag(P(C6H5)3)2(HSeO4)(H2O)]*[Ag(P(C6H5)3)2(HSeO4)]*H2O

Conditions

Conditions	Yield
In ethanol mixt. of Ag salt and ligand dissolved in warm EtOH, cooled, H2SeO4/H2O added, heated with stirring; crystd. on slow cooling to room temp., washed (ice-cold aq. EtOH); elem.anal.;	84%

...Expand

: palladium (II) nitrate

: 7783-08-6
selenic acid

: palladium selenite

Conditions

Conditions	Yield
With KNO3 In water High Pressure; under hydrothermal conditions; appropriate amt. Pd(NO3)2, KNO3, concd. H2SeO4 and H2O placed in autoclave; sealed; heated at 200°C for 4 d; cooled to room temp. (9°C/h); crystals washed with H2O and MeOH; dried; detd. by EDX analysis;	82%

: lanthanum(III) oxide

: 7783-08-6
selenic acid

: 838856-57-8
La(3+)*HSeO3(1-)*SeO4(2-)=La(HSeO3)(SeO4)

Conditions

Conditions	Yield
With KOH; Si(OEt)4; HNO3 In water High Pressure; La2O3 (1 equiv.) (acidified with HNO3), KOH (2 equiv.) and H2SeO4 (3 equiv.) were mixed in H2O; soln. was stirred for 30 min; Si(OEt)4 was addedgradually; stirred at 353 K; sealed in autoclave; heated at 473 K for 3 d; elem. anal.;	80%

: 7783-08-6
selenic acid

: 7440-57-5, 457905-15-6
gold

: 2Au(3+)*2SeO3(2-)*SeO4(2-)=Au2(SeO3)2(SeO4)

Conditions

Conditions	Yield
In water High Pressure; a few pieces of Au and concd. selenic acid placed in steel autoclave; heated at 250°C for 10 h; cooled slowly (5°C/h); crystals washed with water; dried in air;	80%

: 110-85-0
piperazine

: uranyl(VI) acetate dihydrate

: 7783-08-6
selenic acid

: 0.5C4H12N2(2+)*UO2(2+)*HSeO3(1-)*SeO3(2-)=(C4H12N2)0.5(UO2(HSeO3)(SeO3))

Conditions

Conditions	Yield
In water High Pressure; under hydrothermal conditions; U compd., H2SeO4 and piperazine (molar ratio 1:23:2.7) loaded in autoclave; water added; sealed; heated at 130°C for 2 d; cooled to 23°C (9°C/h); mother liquor decanted; crystals washed with MeOH; dried; elem. anal.;	80%

...Expand

: 7446-08-4
selenium(IV) oxide

: lead(II) oxide

: 7783-08-6
selenic acid

: Pb2Se2O7

Conditions

Conditions	Yield
In water at 200℃; for 120h; Autoclave;	80%

...Expand

: 110-85-0
piperazine

: zinc carbonate hydroxide

: 7732-18-5
water

: 7783-08-6
selenic acid

: H8O12Se2Zn(2-)*C4H10N2*2H2O*2H(1+)

Conditions

Conditions	Yield
at 20℃; under 760.051 Torr;	77%

...Expand

: palladium(II) nitrate dihydrate

: 7783-00-8
selenious acid

: 7783-08-6
selenic acid

: O3Se(2-)*Pd(2+)

Conditions

Conditions	Yield
With potassium nitrate In water at 220℃; for 96h; Glovebox; Autoclave;	73.6%

...Expand

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 Cl⁻ → H₂SeO₃ + H₂O + Cl₂

It decomposes above 200°C, liberating oxygen gas and being reduced to selenous acid:
2 H₂SeO₄ → 2 H₂SeO₃ + O₂IUPAC 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 + H₂O₂ → H₂SeO₄

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 Cl₂ → H₂SeO₄ + 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 Toxic T, Dangerous 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

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.

Product Name

Selenic(VI) acid

Synthetic route

Selenic acid Chemical Properties

Selenic acid Uses

Selenic acid Production

Selenic acid Consensus Reports

Selenic acid Safety Profile

Selenic acid Standards and Recommendations

Selenic acid Specification

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