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Unrealed, sharp form of acid present in wine.
Apple acid (Wikipedia)
Malic acid is an organic compound with the molecular formula C4H6O5. It is a dicarboxylic acid that is made by all living organisms, contributes to the sour taste of fruits, and is used as a food additive. Malic acid has two stereoisomeric forms (L- and D-enantiomers), though only the L-isomer exists naturally. The salts and esters of malic acid are known as malates. The malate anion is an intermediate in the citric acid cycle.
DL-Malic acid
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Names | |
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Preferred IUPAC name
2-Hydroxybutanedioic acid | |
Other names
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Identifiers | |
3D model (JSmol)
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ChEBI |
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ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.027.293 |
EC Number |
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E number | E296 (preservatives) |
KEGG | |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
C4H6O5 | |
Molar mass | 134.09 g/mol |
Appearance | Colorless |
Density | 1.609 g⋅cm−3 |
Melting point | 130 °C (266 °F; 403 K) |
558 g/L (at 20 °C) | |
Acidity (pKa) | pKa1 = 3.40 pKa2 = 5.20 |
Hazards | |
GHS labelling: | |
Flash point | 203 °C |
Related compounds | |
Other anions
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Malate |
Related carboxylic acids
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Succinic acid Tartaric acid Fumaric acid |
Related compounds
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Butanol Butyraldehyde Crotonaldehyde Sodium malate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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