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Oxides and peroxides

Chromic acid

Also known as Chromic(VI) acid, Chromic acid (H2CrO4), Acide chromique

CAS 7738-94-5Formula H2CrO4Molar mass 118.01 g/molEC 231-801-5
GHS signal word: Danger. Pictograms: Oxidiser, Corrosive, Acute toxicity (severe), Harmful or irritant 135 suppliers listed
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Chromic acid chemical structure, H2CrO4, CAS 7738-94-5
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Dark purplish-red crystals /Anhydrous chromic acid/
Melting point
196 °C
Boiling point
Ca. 250
Density
1.67-2.82 /Anhydrous chromic acid/
Solubility
In water, 1.1 × 10⁺⁶ mg/L at 17 °C
HS code
281990
Category
Oxides and peroxides
UN number
UN 1755
Illustrative photo, red pigment powder in an open fibre drum in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Chromic acid?

Plain description, key identifiers and synonyms

Chromic acid is a chromium oxoacid. It has a role as an oxidising agent. It is a conjugate acid of a hydrogenchromate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dihydroxy(dioxo)chromium
CAS number
7738-94-5 CAS number cross-checked
EC number
231-801-5
Molecular formula
H2CrO4
UNII
SA8VOV0V7Q
InChIKey
KRVSOGSZCMJSLX-UHFFFAOYSA-L
InChI
InChI=1S/Cr.2H2O.2O/h;2*1H2;;/q+2;;;;/p-2
SMILES (canonical and isomeric)
O[Cr](=O)(=O)O

Synonyms

  • Chromic(VI) acid
  • Chromic acid (H2CrO4)
  • Acide chromique
  • tetraoxochromic acid
  • dihydroxidodioxidochromium
  • H2CrO4
  • dihydrogen(tetraaoxidochromate)
  • (CrO2(OH)2)
  • [CrO2(OH)2]
  • dioxochromiumdiol
  • Chromium hydrogen oxide
  • Chromic (VI) acid
  • Dihydroxidobis(oxido)chromium
  • Chromium hydroxide oxide (cr(oh)2o2)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Dark purplish-red crystals /Anhydrous chromic acid/exp.
Melting point
196 °Cexp.
Boiling point
Ca. 250exp.
Density
1.67-2.82 /Anhydrous chromic acid/exp.
Solubility
In water, 1.1 × 10⁺⁶ mg/L at 17 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
118.01 g/molcalc.
Exact mass
117.9358 Dacalc.
LogP (octanol/water)
-1.35calc.
Topological polar surface area
74.6 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
5calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS03: Oxidiser
Oxidiser
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H271May cause fire or explosion, strong oxidiser.
  • H300Fatal if swallowed.
  • H301Toxic if swallowed.
  • H310Fatal in contact with skin.
  • H314Causes severe skin burns and eye damage.
  • H317May cause an allergic skin reaction.
  • H318Causes serious eye damage.
  • H330Fatal if inhaled.
  • H334May cause allergy or asthma symptoms or breathing difficulties if inhaled.
  • H340May cause genetic defects.
  • H341Suspected of causing genetic defects.
  • H350May cause cancer.

4 more on the safety page.

Precautionary statements (43)
  • P203Obtain, read and follow all safety instructions before use.
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P220Keep away from clothing and other combustible materials.
  • P233Keep container tightly closed.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P262Do not get in eyes, on skin, or on clothing.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P283Wear fire resistant or flame retardant clothing.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P352If on skin: Wash with plenty of water.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P306 + P360If on clothing: Rinse immediately contaminated clothing and skin with plenty of water before removing clothes.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P342 + P316If experiencing respiratory symptoms: Get emergency medical help immediately.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P363Wash contaminated clothing before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P371 + P380 + P375In case of major fire and large quantities: Evacuate area. Fight fire remotely due to the risk of explosion.
  • P391Collect spillage.
  • P403Store in a well-ventilated place.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P420Store separately.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 1755

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Chromic acid suppliers

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All 135 suppliers
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Where suppliers are based

135 suppliers in 31 countries

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Chromic acid price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Chemicals (chromates, oxidizing agents, catalysts), chromium-plating, intermediate, medicine (caustic), process engraving, anodizing, ceramic glazes, colored glass, metal cleaning, inks, tanning, paints, textile mordant, etchant for plastics.

ABS etchant, photographic chemical, aluminum anodizing reagent, chrome electroplating/zinc colorless conversion coatings reagent, side-chain oxidation reagent.

Wood preservative.

Industrial uses: Refrigerants, Plating agent.

Consumer uses: Plating agent.

Roles

  • oxidising agent

How it is made

(1) Sulfuric acid is added to a solution of sodium dichromate and the product is crystalized out, (2) chromite is fused with soda ash and limestone and then treated with sulfuric acid, (3) electrolysis.

Sodium dichromate + sulfuric acid (reaction)

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce, Regulatory flags: Section 6 risk management rule

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Chromic acid is traded under.

HS 2819.90Indicative HS code

Chromium oxides and hydroxides, other

World exports in 2024
$181M
+6.6% vs 2023, imports $320M
2019 to 2024
Top exporters
  1. Kazakhstan * partner reported35.8%
  2. China24.0%
  3. Germany23.8%
Top importers
  1. Estonia29.4%
  2. United Kingdom18.3%
  3. Spain10.1%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Chromic acid is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Chromic acid, based on the data on this page

What is Chromic acid?

Chromic acid is a chromium oxoacid. It has a role as an oxidising agent. It is a conjugate acid of a hydrogenchromate.

What is the CAS number of Chromic acid?

The CAS registry number of Chromic acid is 7738-94-5.

What is the molecular formula and weight of Chromic acid?

The molecular formula of Chromic acid is H2CrO4 and its molar mass is 118.01 g/mol.

What is Chromic acid used for?

Chemicals (chromates, oxidizing agents, catalysts), chromium-plating, intermediate, medicine (caustic), process engraving, anodizing, ceramic glazes, colored glass, metal cleaning, inks, tanning, paints, textile mordant, etchant for plastics.

Is Chromic acid hazardous?

Chromic acid carries the GHS signal word "Danger". Main hazards: may cause fire or explosion, strong oxidiser, fatal if swallowed, toxic if swallowed. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Chromic acid?

Chromic acid is usually classified under HS code 281990 (Chromium oxides and hydroxides, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Chromic acid?

CompoundList lists 135 suppliers of Chromic acid in India, United States, China, United Kingdom and 27 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Chromic acid in India?

27 suppliers in India list Chromic acid on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Chromic acid?

Suppliers quote Chromic acid on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Chromic acid

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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