Oxalic acid

CAS Number
144-62-7
EC Number
205-634-3
Chemical Formula
C2H2O4
Molecular Weight
90.03 g/mol

Description

Oxalic acid (CAS 144-62-7) is a dicarboxylic organic acid used across industrial processing as a reducing agent, chelating agent, and pH regulator. It removes metal ions and mineral deposits from surfaces and process streams. This chemical is a go-to reagent in cleaning, bleaching, and metal finishing operations. In water treatment and industrial cleaning, it dissolves iron oxide and rust deposits from boilers, heat exchangers, and pipework.

The acid effectively cleans systems without damaging base metals. Textile and paper manufacturers use it as a bleaching and stripping agent to remove discoloration from natural fibers and pulp during production. Mining and hydrometallurgical operations rely on it to precipitate rare earth elements and other metals from leach solutions. This process is essential for recovering valuable materials during ore processing.

In personal care formulations, it functions as a pH adjuster and chelating agent. It is commonly found in hair bleaching and skin-lightening products to ensure stability and efficacy in the final formula. The product is supplied as a white crystalline powder or granules, with anhydrous and dihydrate forms available. Standard grades include technical, industrial, and pharmaceutical-grade material for various uses.

Purity levels typically range from 99% to 99.6% to meet strict industry requirements. Packaging options span from small bags to bulk quantities, supporting both laboratory-scale and large industrial supply.

Other Names (Synonyms)

oxalic acid anhydrous|HOOCCOOH|H2ox|ethanedionic acid|ethanedioic acid|ethane-1,2-dioic acid|(COOH)2|hydrogen oxalate

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

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Physical Properties

Melting Point 189.5 °C (decomp)
Boiling Point 158 °C
Density 1.9 g/cm³
Flash Point 101-157°C
Appearance Oxalic acid is a colorless, odorless powder, or granular solid. The anhydrous form (COOH)2 is an odorless, white solid; the solution is a colorless liquid.
Color White
Odor odorless
Form Liquid
Water Solubility 90 g/L (20 ºC)
Vapor Pressure <0.01 mm Hg ( 20 °C)
Refractive Index 1.4261 (estimate)
pH 1 (100g/l, H2O, 20℃)
Log P -1.7 at 23℃

Documentation

Safety & Handling Learn More

Warning
GHS07· Irritant GHS05· Corrosive GHS08· Health Hazard

Hazard Statements

H302 Harmful if swallowed
H312 Harmful in contact with skin
H314 Causes severe skin burns and eye damage
H315 Causes skin irritation

Precautionary Statements

P203 Obtain, consult and follow expert instructions for use.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.

Trade & Regulatory

HS Code 29171110
UN Number 3261
ADR Class 8
Packing Group III
WGK (Germany) 1
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