Chromic acid supplier | CasNO.7738-94-5

Name
Chromic acid
EINECS 231-801-5
CAS No. 7738-94-5
Article Data90
CAS DataBase
Density 2.290
Solubility highly soluble in water
Melting Point 196 °C (dec.)(lit.)
Formula CrH₂O₄
Boiling Point 330oC
Molecular Weight 118.009
Flash Point 250oC
Transport Information UN 1463/1755
Appearance dark purplish red solid
Safety
Risk Codes
Molecular Structure
Hazard Symbols
Synonyms Chromic(VI)acid;Chromium hydroxide oxide (Cr(OH)2O2);
PSA 74.60000
LogP -0.59120

Synthetic route

: chromium(III) sulfate

: 7738-94-5
chromic acid

Conditions

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

: chromium(VI) oxide

: 7664-93-9
sulfuric acid

: 7732-18-5
water

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
at 5 - 35℃; for 0.416667 - 0.5h;

...Expand

: sodium dichromate

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With sulfuric acid In water
With sulfuric acid In sulfuric acid
With H2SO4 In sulfuric acid aq. H2SO4;

: 7732-18-5
water

: 1333-82-0
chromium(VI) oxide

: 7738-94-5
chromic acid

: chromium(VI) oxide

: 7732-18-5
water

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
In water oxide dissoln.;
With sulfuric acid

: chromium(III) oxide

: 7738-94-5
chromic acid

Conditions

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);;

: chromium(III) oxide

: 7732-18-5
water

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With air In neat (no solvent) Cr2O3 placed in quartz boat, vaporized in humid air at 1223 K (pH2O=0.1 bar);

: chromium(VI) oxide

: 7732-18-5
water

A: 7738-94-5
chromic acid

B: 13530-68-2
dichromic acid

Conditions

Conditions	Yield
In neat (no solvent)

...Expand

: potassium chromate

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With H2O In water hydrolysis;;

: chromium(VI) oxide

: 7738-94-5
chromic acid

Conditions

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;

: potassium dichromate

A: 7738-94-5
chromic acid

B: 13907-45-4
chromate(VI) ion

C: 15596-54-0
hydrogen chromate(1-)

D: 13907-47-6
dichromate anion

Conditions

Conditions	Yield
With H2O In water byproducts: H(1+); concd. soln.;;

...Expand

: 13530-68-2
dichromic acid

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With water In water equil. react.;;
With H2O In water equil. react.;;
With H2O In water equil. react.;;

: chromium potassium sulfate dodecahydrate

: 80937-33-3
oxygen

: 10028-15-6
ozone

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With sodium hydroxide In not given reaction by influence of O3-containing O2 on a chrome alum soln. with NaOH in exceed;; formation of a yellow green fluorescent soln., pptn. by influence of NH3 and oxidation to chromic acid in presence of Mn salt and NH3;;

...Expand

: 10025-73-7
chromium(III) chloride

: 10028-15-6
ozone

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
In not given

: chromium(III) sulfate

: 10028-15-6
ozone

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
In not given

: chromium(III) oxide

: 7732-18-5
water

: 80937-33-3
oxygen

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
In neat (no solvent) at 573-1173 K; elem. anal.;

...Expand

: dipotassium peroxodisulfate

: chromium (III) ion

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
In nitric acid	<1
In nitric acid	<1

: dipotassium peroxodisulfate

: 7440-47-3
chromium

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
In water
In water

: chrome ferrate

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With water In water byproducts: FeO2;
With H2O In water byproducts: FeO2;

: 7732-18-5
water

: zinc(II) cation

: 13907-47-6
dichromate anion

A: zinc(II) chromate

B: 7738-94-5
chromic acid

Conditions

Conditions	Yield
In water

...Expand

: aluminum(III) sulfate

: potassium chromate

A: basic aluminium sulfate

B: 7738-94-5
chromic acid

Conditions

Conditions	Yield
In not given the influence of mixing gelatinous pptn. after boiling crystalline pptn., which soluble by cooling; evapn.;
In not given the influence of mixing gelatinous pptn. after boiling crystalline pptn., which soluble by cooling; evapn.;

...Expand

: chromium(III) oxide * x H2O

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With periodate ions In perchloric acid Kinetics; UV-VIS spectrometry;
With dihydrogen peroxide In water

: chromium(VI) oxide *SO3

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With water In water byproducts: H2SO4; strongly exothermic dissoln. in H2O;;
With H2O In water byproducts: H2SO4; strongly exothermic dissoln. in H2O;;

: Cr(6+)*2O(2-)*OH(1-)*CH3CO2(1-)=CrO2(OH)(CH3CO2)

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With water In water byproducts: CH3CO2H; hydrolysis in water;;
With water In neat (no solvent) byproducts: CH3CO2H; hydrolysis in moist air;;
With H2O In neat (no solvent) byproducts: CH3CO2H; hydrolysis in moist air;;
With H2O In water byproducts: CH3CO2H; hydrolysis in water;;

: Pb(2+)*Cr2O7(2-)=PbCr2O7

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With calcium hydroxide; oxalic acid In water boiling of PbCrO4 with lime milk; filtration; addn. of oxalic acid to filtrate; filtration of pptd. Ca oxalate;;
With lime milk; oxalic acid In water boiling of PbCrO4 with lime milk; filtration; addn. of oxalic acid to filtrate; filtration of pptd. Ca oxalate;;

: Pb(2+)*Cr2O7(2-)=PbCr2O7

: 144-62-7
oxalic acid

A: 7738-94-5
chromic acid

B: 781577-54-6
calcium(II) oxalate

Conditions

Conditions	Yield
With milk of lime In water boiling PbCrO4 with milk of lime, filtration, decompn. of CaCrO4, contained in the filtrate, by oxalic acid;; filtration from Ca-oxalate;;
With milk of lime In water boiling PbCrO4 with milk of lime, filtration, decompn. of CaCrO4, contained in the filtrate, by oxalic acid;; filtration from Ca-oxalate;;

...Expand

: chromium(VI) pentoxide

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
In diethyl ether vac. distn. at -20 °C; decompn. on heating;;
In water byproducts: O2; decompn. in the presence of acetone only at 50 °C under color change;;

: chromium(III) bromate

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With water In water byproducts: Br2; evapn. of soln. on the water-bath;;
With H2O In water byproducts: Br2; evapn. of soln. on the water-bath;;

: ammonium chromate(VI) *2 chromylfluoride

: 7738-94-5
chromic acid

Conditions

Conditions	Yield
byproducts: HF; decompn. by acids;;
byproducts: HF; decompn. by acids;;

: ammonium tetrachromate(VI)

A: ammonium dichromate(VI)

B: 7738-94-5
chromic acid

Conditions

Conditions	Yield
With H2O in moist air;;

: 7738-94-5
chromic acid

: 123-54-6
acetylacetone

: chromium(III) acetylacetonate

Conditions

Conditions	Yield
In water at 0 - 60℃; for 0.5h;	86.5%

: (E)-2-isobutyl-3,3-difluoro-6-cyclohexyl-4-hexenal

: 7738-94-5
chromic acid

: (E)-2-isobutyl-3,3-difluoro-6-cyclohexyl-4-hexenoic acid

Conditions

Conditions	Yield
	70%

: 7738-94-5
chromic acid

: chromium (III) ion

Conditions

Conditions	Yield
With dihydrogen peroxide pH = 1.96 by added acid, excess of H2O2;	57.5%
With H2O2 pH = 1.96 by added acid, excess of H2O2;	57.5%
With dihydrogen peroxide pH = 2.2, excess of H2O2;	28.5%

: chromium(VI) oxide

: chromium(III) oxide

: 7738-94-5
chromic acid

: 7429-90-5
aluminium

: 7440-47-3
chromium

Conditions

Conditions	Yield
100 kg Cr2O3, 3-4 kg CrO3 and 34-35 kg Al powder, in presence of chromic acid increases the yield and accelerates the redn.;

...Expand

: potassium chromate

: 7738-94-5
chromic acid

: potassium dichromate

Conditions

Conditions	Yield
In water crystn. from acidified aq. K2CrO4 satd. at elevated temp.;;

: 7738-94-5
chromic acid

: 7558-02-3
potassium bromide

: 7726-95-6
bromine

Conditions

Conditions	Yield
warming;

: ammonium persulfate

: chromium (III) ion

: 7738-94-5
chromic acid

: 13907-47-6
dichromate anion

Conditions

Conditions	Yield
silver (I) ion In not given
silver (I) ion In not given

...Expand

: hydrogen

: 7738-94-5
chromic acid

: 7440-47-3
chromium

Conditions

Conditions	Yield
With sulfuric acid In water byproducts: H2O; Electrochem. Process; chromic acid reduced with nascent H developing on cathode so Cr2(SO4)3 formes, redn. of Cr(3+) on cathode, voltage > 3.4 V;
With H2SO4 In water byproducts: H2O; Electrochem. Process; chromic acid reduced with nascent H developing on cathode so Cr2(SO4)3 formes, redn. of Cr(3+) on cathode, voltage > 3.4 V;

: 7738-94-5
chromic acid

: 7440-66-6
zinc

: 13907-45-4
chromate(VI) ion

Conditions

Conditions	Yield
In water reaction of 1 % soln. of chromic acid with clean Zn-stripes;;
In water

: 7738-94-5
chromic acid

: potassium hydroxide

: potassium chromate

Conditions

Conditions	Yield
In not given addn. of KOH to H2CrO4 soln.;;
In not given addn. of KOH to H2CrO4 soln.;;

: 7664-93-9
sulfuric acid

: 7738-94-5
chromic acid

: 10028-15-6
ozone

Conditions

Conditions	Yield
In not given Electrolysis; smaller yields than by use of a pure H2SO4 soln.;;

: 7664-93-9
sulfuric acid

: 7738-94-5
chromic acid

A: 1333-74-0
hydrogen

B: 80937-33-3
oxygen

C: 10028-15-6
ozone

Conditions

Conditions	Yield
In not given Electrolysis; higher yields by use of a H2SO4 containing chromic acid soln. than by use of a diluted H2SO4 soln.;; O3 concentration of 1 mg/10 l detonating gas;;
In not given Electrolysis; higher yields by use of a H2SO4 containing chromic acid soln. than by use of a diluted H2SO4 soln.;; O3 concentration of 1 mg/10 l detonating gas;;

...Expand

: 7738-94-5
chromic acid

: 10028-15-6
ozone

Conditions

Conditions	Yield
In not given Electrolysis; reaction by use of a saturated soln. of chromic acid;;
In melt Electrolysis; reaction by use of molten chromic acid;;	0%
In not given Electrolysis; higher yields at decreasing temperatures;;

: 7738-94-5
chromic acid

: chromium(III) oxide

Conditions

Conditions	Yield
Electrolysis;
With H chromic acid is reacting to Cr2O3 on contact with Pd-sheet, satd. with H;;
With bromocyane; water In not given byproducts: CO2, NH3, Br2; 0.5-50 % H2CrO4 soln.; oxalic acid or NH4 oxalate intermediates stated in 0.25 % chromate soln.;

: 7738-94-5
chromic acid

A: chromium(III) oxide

B: potassium chromate

Conditions

Conditions	Yield
With potassium bromide In not given byproducts: Br2; heating of KBr soln. in aq. H2CrO4 soln.;;
With potassium iodide In not given react. even in coldness and in dild. solns.;;
With KBr In not given byproducts: Br2; heating of KBr soln. in aq. H2CrO4 soln.;;
With KI In not given react. even in coldness and in dild. solns.;;

: 7738-94-5
chromic acid

: 7440-47-3
chromium

Conditions

Conditions	Yield
With formic acid; sulfuric acid In sulfuric acid Electrochem. Process; electrodeposition (40 A/dm**2, 1 h, 25°C); X-ray diffraction;
With formic acid In sulfuric acid Electrochem. Process; electrodeposition (current density 40 A/dm**2, 20-50°C, 30 min); X-ray and electron diffraction, electron microscopy, differential thermal anal.;
With sulfuric acid In sulfuric acid Electrochem. Process; electrodeposition (40 A/dm**2, 1 h, 25°C); X-ray diffraction;

: 7738-94-5
chromic acid

: potassium dichromate

Conditions

Conditions	Yield
With potassium hydroxide In potassium hydroxide neutralisation of H2CrO4 soln. with KOH;;

: 1333-74-0
hydrogen

: 7738-94-5
chromic acid

: chromium(III) oxide *H2O

Conditions

Conditions	Yield
In water 150-180 atm H2 pressure, 300°C, 2n H2CrO4 soln.;

: chromium(VI) oxide

: 86119-84-8, 7664-38-2
phosphoric acid

: 7738-94-5
chromic acid

: 584-08-7
potassium carbonate

: 3K2O*P2O5*8CrO3

Conditions

Conditions	Yield
In water addn. of K2CO3 (0.75 equiv.) to concd. soln. containg H3PO4 (1 equiv.), H2CrO4 and CrO3 (8 equiv.);;
In water addn. of K2CO3 (0.75 equiv.) to concd. soln. containg H3PO4 (1 equiv.), H2CrO4 and CrO3 (8 equiv.);;

...Expand

Chromic acid Chemical Properties

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]

Chromic acid 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.

Chromic acid 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.

Chromic acid Consensus Reports

Reported in EPA TSCA Inventory. Chromium and its compounds are on the Community Right-To-Know List.

Chromic acid 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.

Chromic acid 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

Chromic acid Analytical Methods

For occupational chemical analysis use NIOSH: Chromium Hexavalent 7024.

Chromic acid 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.

Product Name

Chromic acid

Synthetic route

Chromic acid Chemical Properties

Chromic acid Uses

Chromic acid Toxicity Data With Reference

Chromic acid Consensus Reports

Chromic acid Safety Profile

Chromic acid Standards and Recommendations

Chromic acid Analytical Methods

Chromic acid Specification

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