Maleic acid
Maleic acid is an organic compound with the molecular formula C4H4O4.
- Formula
- C4H4O4
- Functional group
- Carboxylic acids; Dicarboxylic acids
- Molar mass
- 116.07 g/mol
- Also known as
- (Z)-but-2-enedioic acid, cis-butenedioic acid, Toxilic acid, Maleinic acid, Malenic acid, (2Z)-but-2-enedioic acid, (Z)-Butenedioic acid
Overview
Maleic acid is an organic compound with the molecular formula C4H4O4.
Identifiers
- Formula
- C4H4O4
- Functional group
- Carboxylic acids; Dicarboxylic acids
- Molar mass
- 116.07 g/mol
- Also known as
- (Z)-but-2-enedioic acid, cis-butenedioic acid, Toxilic acid, Maleinic acid, Malenic acid, (2Z)-but-2-enedioic acid, (Z)-Butenedioic acid
Chemical identifiers
- SMILES
- C(=C\C(=O)O)\C(=O)O
- InChI
- InChI=1S/C4H4O4/c5-3(6)1-2-4(7)8/h1-2H,(H,5,6)(H,7,8)/b2-1-
- PubChem CID
- 444266
Properties
- Melting Point
- 132.5 °C (OECD Guideline 102 (Melting point / Melting Range))
- Boiling / decomposition
- 275 °F at 760 mmHg (decomposes) (NTP, 1992)
- Density
- 1.590 g/cu cm at 20 °C
- Water solubility
- 79.000 lb/100 lb water at 77 °F
Related compounds
- Carboxylic acids
Maleic acid is an organic compound with the molecular formula C4H4O4.
- Dicarboxylic acids
Maleic acid is an organic compound with the molecular formula C4H4O4.
References
- PubChem Compound Summary: Maleic acid (CID 444266)National Center for Biotechnology Information · PubChem
Identity, molecular formula, molecular weight and aliases retrieved via PUG REST on 2026-09-08.
- Hazardous Substances Data Bank (HSDB): Maleic acid — melting pointHazardous Substances Data Bank (HSDB)
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/444266#section=Melting-Point. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: ECHA; Search for Chemicals. Maleic Acid (CAS 110-16-7) Registered Substances Dossier. European Chemical Agency. Available from, as of Mar 12, 2015: https://echa.europa.eu/
- CAMEO Chemicals: Maleic acid — boiling pointCAMEO Chemicals
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/444266#section=Boiling-Point. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: National Toxicology Program, Institute of Environmental Health Sciences, National Institutes of Health (NTP). 1992. National Toxicology Program Chemical Repository Database. Research Triangle Park, North Carolina.
- Hazardous Substances Data Bank (HSDB): Maleic acid — densityHazardous Substances Data Bank (HSDB)
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/444266#section=Density. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Haynes, W.M. (ed.). CRC Handbook of Chemistry and Physics. 95th Edition. CRC Press LLC, Boca Raton: FL 2014-2015, p. 3-340
- Hazardous Substances Data Bank (HSDB): Maleic acid — solubilityHazardous Substances Data Bank (HSDB)
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/444266#section=Solubility. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: U.S. Coast Guard, Department of Transportation. CHRIS - Hazardous Chemical Data. Volume II. Washington, D.C.: U.S. Government Printing Office, 1984-5.