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Citric Acid

CAS Number: 77‑92‑9

Synonyms: Citric acid; 2‑Hydroxypropane‑1,2,3‑tricarboxylic acid; Anhydrous citric acid; E 330; Sour salt

Chemical Formula:C₆H₈O₇

Product Introduction

Citric acid is a colorless or white crystalline weak organic acid, naturally found in citrus fruits and industrially produced via fermentation. It’s a key ingredient in food, beverage, pharmaceutical, and chemical industries—used as an acidifier, chelating agent, and preservative

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Physical & Chemical Properties

Property	Value
Appearance	Colorless to white crystalline solid
Density @ 20 °C	~1.67 g/cm³
Melting Point	153–159 °C
Boiling Point	~248 °C (decomposes)
Solubility in Water	1.33 kg/L (maximum)
Molecular Weight	192.12 g/mol
pKa	3.13, 4.76, 6.40 (three carboxyl groups)

Applications

Food & beverages: Acidulant, preservative (E 330), flavor enhancer, sequestrant.
Industrial & lab: Used in detergents, cleaners, pharmaceuticals, cosmetics, metal processing, chelation formulations.
Chemical intermediate: Precursor for biodegradable polymers, esterification catalysts, buffer formulations.