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Oxalic acid dihydrate

Oxalic acid dihydrate
Oxalic acid dihydrate structure
Chemical Name:
Oxalic acid dihydrate
Oxalate Acid;Has two acid;OxalicAcidGr;OXALIC ACID 2H2O;OXALIC ACID PURE;ETHANEDIOIC ACID;Ethanedionic acid;ic acid dihydrate;OxalicAcidPurified;Oxalsαure-dihydrat
Molecular Formula:
Formula Weight:
MOL File:

Oxalic acid dihydrate Properties

Melting point:
104-106 °C(lit.)
Boiling point:
1,65 g/cm3
vapor density 
4.4 (vs air)
vapor pressure 
<0.01 mm Hg ( 20 °C)
Flash point:
storage temp. 
Store at +5°C to +30°C.
H2O: soluble1M at 20°C, clear, colorless
Yellow to yellow-green
Specific Gravity
~1.0 (25℃, 1M in H2O)
PH Range
6 - 8 at 25 °C
Water Solubility 
138 g/L (20 ºC)
157 ºC
Exposure limits
TLV-TWA for anhydrous acid 1 mg/m3 (ACGIH, MSHA, and OSHA); TLV-STEL 2 mg/m3 (ACGIH).
Stable. Incompatible with bases, acid chlorides, steel, silver, silver compounds, moisture. Avoid contact with metals.
CAS DataBase Reference
6153-56-6(CAS DataBase Reference)
NIST Chemistry Reference
Oxalic acid dihydrate(6153-56-6)
EPA Substance Registry System
Oxalic acid dihydrate (6153-56-6)
  • Risk and Safety Statements
Signal word  Danger
Hazard statements  H302-H312-H302+H312-H318
Precautionary statements  P301+P312a-P310a-P321-P501a-P280-P301+P312+P330-P305+P351+P338+P310-P305+P351+P338
Hazard Codes  Xn,C
Risk Statements  21/22-41
Safety Statements  24/25-39-37-36-26
RIDADR  UN 3261 8/PG 3
WGK Germany  1
RTECS  RO2450000
HazardClass  8
PackingGroup  III
HS Code  29171100
Toxicity LD50 orally in Rabbit: 375 mg/kg
NFPA 704
2 0

Oxalic acid dihydrate price More Price(50)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 8.18242 Oxalic acid dihydrate for synthesis 6153-56-6 100 g $31.36 2021-03-22 Buy
Sigma-Aldrich 1.00495 Oxalic acid dihydrate for analysis EMSURE? ACS,ISO,Reag. Ph Eur 6153-56-6 100 g $77.7 2021-03-22 Buy
Sigma-Aldrich 8.18242 Oxalic acid dihydrate for synthesis 6153-56-6 1 kg $83.99 2021-03-22 Buy
Sigma-Aldrich OX0270 Oxalic Acid, Dihydrate Meets ACS Specifications, Meets Reagent Specifications for testing USP/NF monographs GR ACS 6153-56-6 500 g $95.27 2021-03-22 Buy
Sigma-Aldrich 1.00495 Oxalic acid dihydrate for analysis EMSURE? ACS,ISO,Reag. Ph Eur 6153-56-6 500 g $132.27 2021-03-22 Buy

Oxalic acid dihydrate Chemical Properties,Uses,Production

Chemical Properties

white crystals


Oxalic acid dihydrate is a purifying agent in pharmaceutical industry, special in antibiotic medication, such as Oxytetracycline , Chloramphenicol , etc; * Precipitating agent in Rare-earth mineral processing; * Bleaching agent in the textile activities, wood pulp bleaching; * Rust-remover for Metal treatment; * Grinding agent, such as Marble polishing; * Waste water treatment, removing calcium from water.


A diprotic reducing agent used as a buffer.


Oxalic acid occurs in the cell sap of Oxalisand Rumex species of plants as the potassium and calcium salt. It is the metabolicproduct of many molds (Merck 1989). Thereare a large number of applications of thiscompound, including indigo dyeing; calicoprinting; removal of paint, rust, and inkstains; metal polishing; bleaching leather; inpesticide compositions and manufacture ofoxalates. It is also used as an analyticalreagent and as a reducing agent in organicsynthesis.
Addition of oxalic acid to chromic acid forthe anodizing of Al alloy has been reported tomodify the morphology and improve the corrosion performance of anodic films (Moutarlier et al. 2004). Also, it is a very effectiveadditive for the ozone treatment of cellulose.It prevents the degradation of cellulose fromozone bleaching.

Reactivity Profile

At high temperatures oxalic acid decomposes, producing toxic carbon monoxide, andformic acid. Mixing with warm sulfuric acidmay produce the same products: CO2, CO,and formic acid. It reacts with many silvercompounds, forming explosive silver oxalate(NFPA 1986). An explosion occurred whenwater was added to an oxalic acid/sodiumchlorite mixture in a stainless steel beaker.There was also evolution of highly toxicchlorine dioxide gas (MCA 1962). Oxalicacid reacts violently with strong oxidizingsubstances.

Health Hazard

Oxalic acid is a strong poison. The toxicsymptoms from ingestion include vomiting, diarrhea, and severe gastrointestinaldisorder, renal damage, shock, convulsions,and coma. Death may result from cardiovascular collapse. The toxicity arises asoxalic acid reacts with calcium in the tissuesto form calcium oxalate, thereby upsettingthe calcium/potassium ratio (ACGIH 1986).Deposition of oxalates in the kidney tubulesmay result in kidney damage (Hodgson et al.1988).
Oxalic acid may be absorbed into the bodythrough skin contact. It is corrosive to theskin and eyes, producing burns. Dilute solutions of 10% strength may be a mild irritantto human skin. However, the inhalation toxicity is low because of its low vapor pressure.Airborne dusts can produce eyeburn and irritation of the respiratory tract.
LD50 value, oral (rats): 375 mg/kg.

Purification Methods

Crystallise oxalic acid from distilled water. Dry it in a vacuum over H2SO4. The anhydrous acid can be obtained by drying at 100o overnight. [Beilstein 2 IV 1819.]

Oxalic acid dihydrate Preparation Products And Raw materials

Raw materials

Preparation Products

Oxalic acid dihydrate Suppliers

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View Lastest Price from Oxalic acid dihydrate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-09-02 Oxalic acid dihydrate
US $10.00 / Kg/Bag 1KG 99% 10 Tons Hebei Senko Biotechnology Co., Ltd.
2021-09-01 Oxalic acid dihydrate
US $10.00 / KG 1KG 99% 10 mt Hebei Guanlang Biotechnology Co., Ltd.
2021-08-23 Oxalic acid dihydrate
US $1.00 / KG 1KG 99.6%Min 20ton/month Wuhan Shuokang Biological Technology Co.,Ltd

Oxalic acid dihydrate Spectrum

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