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Dicarbonic acid

Also known as Pyrocarbonic acid, carboxy hydrogen carbonate

CAS 503-81-1Formula C2H2O5Molar mass 106.03 g/mol
Dicarbonic acid chemical structure, C2H2O5, CAS 503-81-1
2D chemical structure

Key facts

What buyers check first

CAS number
503-81-1
Formula
C2H2O5
Molar mass
106.03 g/mol
HS code
281119
Category
Inorganic acids

What is Dicarbonic acid?

Plain description, key identifiers and synonyms

Dicarbonic acid is an acyclic carboxylic anhydride and a chalcocarbonic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
carboxy hydrogen carbonate
CAS number
503-81-1
Molecular formula
C2H2O5
InChIKey
ZFTFAPZRGNKQPU-UHFFFAOYSA-N
InChI
InChI=1S/C2H2O5/c3-1(4)7-2(5)6/h(H,3,4)(H,5,6)
SMILES (canonical and isomeric)
C(=O)(O)OC(=O)O

Synonyms

  • Pyrocarbonic acid
  • carboxy hydrogen carbonate

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
106.03 g/molcalc.
Exact mass
105.9902 Dacalc.
LogP (octanol/water)
0.36calc.
Topological polar surface area
83.83 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
0calc.
Heavy atoms
7calc.
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

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

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

Dicarbonic acid suppliers

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Dicarbonic 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

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2811.19Indicative HS code

Inorganic acids, other than hydrogen fluoride

World exports in 2024
$494M
+6.5% vs 2023, imports $458M
2019 to 2024
Top exporters
  1. China24.9%
  2. Israel16.0%
  3. Jordan * partner reported11.7%
Top importers
  1. China29.3%
  2. United States16.2%
  3. Germany7.0%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Dicarbonic acid?

Dicarbonic acid is an acyclic carboxylic anhydride and a chalcocarbonic acid.

What is the CAS number of Dicarbonic acid?

The CAS registry number of Dicarbonic acid is 503-81-1.

What is the molecular formula and weight of Dicarbonic acid?

The molecular formula of Dicarbonic acid is C2H2O5 and its molar mass is 106.03 g/mol.

Is Dicarbonic acid hazardous?

No GHS hazard classification for Dicarbonic acid is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Dicarbonic acid?

Dicarbonic acid is usually classified under HS code 281119 (II. INORGANIC ACIDS AND INORGANIC OXYGEN COMPOUNDS OF NON-METALS, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Dicarbonic acid?

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What is the price of Dicarbonic acid?

Suppliers quote Dicarbonic 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 Dicarbonic 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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