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Oxalic Acid

Name: Oxalic Acid
SKU: 0

Basic Information

CAS No.: 144-62-7
Molecular Formula: C2H2O4
Molecular weight: 90.03

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Product Details

Oxalic acid is an organic substance with the chemical formula C2H2O4. It is a metabolite of organisms, a medium-strong acid, widely distributed in plants, animals and fungi, and plays different functions in different organisms. Studies have found that more than 100 plants are rich in oxalic acid, especially spinach, amaranth, beet, purslane, taro, sweet potato and rhubarb. Since oxalic acid can reduce the bioavailability of mineral elements, it is easy to form calcium oxalate with calcium ions in the human body, causing kidney stones, so oxalic acid is often considered to be an antagonist of mineral element absorption and utilization. Its anhydride is carbon trioxide.

Chemical Properties

Property	Value
Melting point	189.5 °C (dec.)(lit.)
Boiling point	365.1°C (estimate)
Density	0.99 g/mL at 25 °C
Vapor density	4.4 (vs air)
Vapor pressure	<0.01 mm Hg ( 20 °C)
Refractive index	1.4261 (estimate)
Fp	101-157°C
Storage temp.	Store below +30°C.
Solubility	Water: soluble108g/L at 25°C
Form	Liquid
Pka	1.23(at 25℃)
Color	White
PH Range	6 - 8 at 25 °C
PH	3(1 mM solution);2.09(10 mM solution);1.31(100 mM solution);
Odor	Odorless
Water Solubility	90 g/L (20 ºC)
Sublimation	101-157 ºC
Merck	14,6911
BRN	385686
Henry's Law Constant	1.43 at pH 4 (quoted, Gaffney et al., 1987)
Exposure limits	NIOSH REL: TWA 1, STEL 2, IDLH 500; OSHA PEL: TWA 1; ACGIH TLV: TWA 1, STEL 2 (adopted).
Stability:	Stable, but moisture sensitive. Incompatible with metals.
InChIKey	MUBZPKHOEPUJKR-UHFFFAOYSA-N
LogP	-1.7 at 23℃
CAS DataBase Reference	144-62-7(CAS DataBase Reference)
NIST Chemistry Reference	Oxalic acid(144-62-7)
EPA Substance Registry System	Oxalic acid (144-62-7)

Safety Information

Property	Value
Hazard Codes	Xn
Risk Statements	21/22-63-34-41
Safety Statements	24/25-23-36/37/39-27-26-39-37-36-36/37
RIDADR	UN 3261 8/PG 3
WGK Germany	1
RTECS	RO2450000
TSCA	Yes
HazardClass	8
PackingGroup	III
HS Code	29171110
Hazardous Substances Data	144-62-7(Hazardous Substances Data)
Toxicity	LD50 orally in Rabbit: 375 mg/kg
IDLA	500 mg/m3

Product Usage

Oxalic acid is a highly versatile organic compound widely utilized across various industrial sectors. Its primary application lies in surface treatment and cleaning, where it acts as a potent rust remover for metal parts and a bleaching agent for wood and textiles. In the chemical industry, it serves as a crucial reagent for synthesizing pharmaceutical intermediates and purifying rare earth elements. Additionally, it is employed in commercial laundry to remove stubborn mineral stains and in wastewater treatment to neutralize alkaline solutions.

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Oxalic Acid

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