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Oxides and peroxides

Dichromic acid

Also known as Dichromic(VI) acid, Dichromsaeure, Chromic acid (H2Cr2O7)

CAS 13530-68-2Formula H2Cr2O7Molar mass 218.00 g/molEC 236-881-5
GHS signal word: Danger. Pictograms: Harmful or irritant, Serious health hazard, Hazardous to the environment 3 suppliers listed
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Dichromic acid chemical structure, H2Cr2O7, CAS 13530-68-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
13530-68-2
Formula
H2Cr2O7
Molar mass
218.00 g/mol
EC number
236-881-5
HS code
281990
Category
Oxides and peroxides

What is Dichromic acid?

Plain description, key identifiers and synonyms

Dichromic acid is a chromium oxoacid. It is a conjugate acid of a hydrogen dichromate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
hydroxy-(hydroxy(dioxo)chromio)oxy-dioxochromium
CAS number
13530-68-2 CAS number cross-checked
EC number
236-881-5
Molecular formula
H2Cr2O7
InChIKey
CMMUKUYEPRGBFB-UHFFFAOYSA-L
InChI
InChI=1S/2Cr.2H2O.5O/h;;2*1H2;;;;;/q2*+1;;;;;;;/p-2
SMILES (canonical and isomeric)
O[Cr](=O)(=O)O[Cr](=O)(=O)O

Synonyms

  • Dichromic(VI) acid
  • Dichromsaeure
  • Chromic acid (H2Cr2O7)
  • H2Cr2O7
  • mu-oxo-hexaoxodichromic acid
  • dihydrogen(heptaoxidodichromate)
  • [(HO)Cr(O)2OCr(O)2(OH)]
  • mu-oxido-bis(hydroxidodioxidochromium)
  • ((HO)Cr(O)2OCr(O)2(OH))
  • Dichromic acid (H2Cr2O7)
  • hydroxy-(hydroxy(dioxo)chromio)oxy-dioxochromium
  • Dihydroxidomu-oxidotetrakis(oxido)dichromium
  • Chromic acid, solid [NA1463] [Oxidizer]

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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
218.00 g/molcalc.
Exact mass
217.8611 Dacalc.
LogP (octanol/water)
-1.66calc.
Topological polar surface area
118 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
2calc.
Heavy atoms
9calc.
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
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

  • H317May cause an allergic skin reaction.
  • H350May cause cancer.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (13)
  • P203Obtain, read and follow all safety instructions before use.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • 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.
  • P302 + P352If on skin: Wash with plenty of water.
  • P318If exposed or concerned, get medical advice.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

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

Dichromic acid suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 3 suppliers

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Where suppliers are based

3 suppliers in 3 countries

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Dichromic acid price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

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 Dichromic 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 Dichromic acid is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

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

What is Dichromic acid?

Dichromic acid is a chromium oxoacid. It is a conjugate acid of a hydrogen dichromate.

What is the CAS number of Dichromic acid?

The CAS registry number of Dichromic acid is 13530-68-2.

What is the molecular formula and weight of Dichromic acid?

The molecular formula of Dichromic acid is H2Cr2O7 and its molar mass is 218.00 g/mol.

Is Dichromic acid hazardous?

Dichromic acid carries the GHS signal word "Danger". Main hazards: may cause an allergic skin reaction, may cause cancer, very toxic to aquatic life. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Dichromic acid?

Dichromic 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 Dichromic acid?

CompoundList lists 3 suppliers of Dichromic acid in China, France and Japan. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Dichromic acid?

Suppliers quote Dichromic 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 Dichromic 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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