Citric acid

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Properties

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General

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Name

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Citric acid

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Chemical formula

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C6H8O7, or alternatively:

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CH2(COOH)•COH(COOH)•CH2(COOH)

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Formula weight

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192.13 u

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Synonyms

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2-hydroxy-1,2,3-propanetricarboxylic acid

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SMILES

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OC(CC(=O)O)(CC(=O)O)C(=O)O

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CAS number

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77-92-9

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Phase behavior

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Melting point

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426 K (153 °C)

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Thermal decomposition temperature

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448 K (175 °C)

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Acid-base properties

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pKa1

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3.15

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pKa2

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4.77

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pKa3

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5.19

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Solid properties

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ΔfH0

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-1543.8 kJ/mol

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S0

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252.1 J/(mol·K)

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Cp

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226.5 J/(mol·K)

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Density

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1.665 ×103 kg/m3

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Safety

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Acute effects

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Skin and eye irritant.

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Chronic effects

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None.

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More info

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Properties

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NIST WebBook

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MSDS

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Hazardous Chemical Database

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SI units were used where possible. Unless otherwise stated, standard conditions were used.

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Disclaimer and references

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Citric acid is a weak organic acid found in citrus fruits. It is a good, natural preservative and is also used to add an acidic (sour) taste to foods and soft drinks. In biochemistry, it is important as an intermediate in the citric acid cycle and therefore occurs in the metabolism of almost all living things. It also serves as an environmentally benign cleaning agent and acts as an antioxidant.

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Citric acid exists in a variety of fruits and vegetables, but it is most concentrated in lemons and limes, where it can comprise as much as 8% of the dry weight of the fruit.

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Citric acid's chemical formula is C6H8O7 and its structure is shown at right. This structure is reflected in its IUPAC name 2-hydroxy-1,2,3-propanetricarboxylic acid.

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C: :This page is about the letter C itself. For other uses of C, see C (disambiguation)....

H: H is the eighth letter of the Latin alphabet....

O: "?", or "?", is a vowel and a letter in the Estonian alphabet, representing a close-mid back unrounded vowel sound ....

Citric acid related Images and Photos (experimental)

Acid	Acid Jazz II	Jenny Lewis: Acid Tongue	Modern Marvels: Acid DVD
Jenny Lewis: Acid Tongue	Acid Italian Movie Poster 1968	Tartaric Acid Crystals Polarized View	Vitamin C Ascorbic Acid . Polarized Lm
PixelJunk Shooter 2 Acid Test	PixelJunk Shooter 2 Acid Test	PixelJunk Shooter 2 Acid Test	Leon Spencer - Legends of Acid Jazz: Leon Spencer