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

~ Table of Content ~

Introduction
Properties
History
Production
Uses
Safety
References
 
FR: Acide citrique


 

~ Related Subjects ~

C6 (1) - Chemical formula (1) - O7 (1) - H8 (1) - Antioxidant (1) - Metabolism (1) - Lime (1) - Lemon (1) - Letter (1) - Vowel (1) - Close-mid back unrounded vowel (1) - Estonian alphabet (1) - Hydroxy (1) - IUPAC (1) - Carboxylic acid (1) -
 

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