| Identification | More | [Name]
Disodium oxalate | [CAS]
62-76-0 | [Synonyms]
DI-SODIUM OXALATE
ETHANEDIOIC ACID SODIUM SALT
OXALATE, ION CHROMATOGRAPHY STANDARD SOLUTION
OXALIC ACID DISODIUM SALT
OXALIC ACID SODIUM SALT
SODIUM ETHANEDIOATE
SODIUM OXALATE
SODIUM OXALATE STANDARD
disodiumethanedioate
Ethanedioicacid,disodiumsalt
Ethanedioicaciddisodiumsalt
natriumoxalat
oxalatedesodium
stavelansodny
OXALIC ACID DISODIUM
SODIUM OXALATE SOLUTION 25G/L
SODIUM OXALATE 99.5+% A.C.S. REAGENT
SODIUM OXALATE, 99.99+%
Sodium oxalate, certified standard titrimetric substance
SODIUM OXALATE PURIFIED 99% | [EINECS(EC#)]
200-550-3 | [Molecular Formula]
C2Na2O4 | [MDL Number]
MFCD00012465 | [Molecular Weight]
134 | [MOL File]
62-76-0.mol |
| Chemical Properties | Back Directory | [Appearance]
White, crystalline powder. Soluble in water; insolu-
ble in alcohol.
| [Melting point ]
250-270 °C
| [density ]
2.34 | [storage temp. ]
Store at RT. | [solubility ]
H2O: 0.1 M at 20 °C, clear, colorless
| [form ]
Powder | [color ]
White | [Odor]
odorless | [PH]
7-8.5 (25℃, 2.5% in H2O) | [Stability:]
Stability Stable; hygroscopic. Incompatible with strong oxidizing agents. | [Water Solubility ]
37 g/L (20 ºC) | [Sensitive ]
Hygroscopic | [Merck ]
14,8650 | [BRN ]
3631622 | [CAS DataBase Reference]
62-76-0(CAS DataBase Reference) | [NIST Chemistry Reference]
Sodium oxalate(62-76-0) | [EPA Substance Registry System]
62-76-0(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
Xn | [Risk Statements ]
R21/22:Harmful in contact with skin and if swallowed .
R34:Causes burns. | [Safety Statements ]
S24/25:Avoid contact with skin and eyes .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing . | [RIDADR ]
3282 | [WGK Germany ]
1
| [RTECS ]
KI1750000
| [F ]
21 | [TSCA ]
No | [HazardClass ]
6.1(b) | [PackingGroup ]
III | [HS Code ]
29171100 | [Toxicity]
LD50 orally in Rabbit: 375 mg/kg |
| Hazard Information | Back Directory | [General Description]
Odorless white solid. Sinks and mixes slowly with water. | [Reactivity Profile]
SODIUM OXALATE(62-76-0) gives basic aqueous solutions. Neutralizes acids in exothermic reactions. Can serve as a reducing agent in reactions that generate carbon dioxide. | [Air & Water Reactions]
Water soluble. | [Hazard]
Toxic by ingestion. | [Health Hazard]
Inhalation or ingestion causes pain in throat, esophagus, and stomach; mucous membranes turn white; other symptoms include vomiting, severe purging, weak pulse, cardiovascular collapse, neuromuscular symptoms, and kidney damage. Contact with eyes or skin causes irritation. | [Description]
Sodium oxalate, or disodium oxalate, is the sodium salt of oxalic acid with the molecular formula Na2C2O4. It is usually a white, crystalline, odorless powder, that decomposes at 250–270 °C.
Disodium oxalate can act as a reducing agent, and it may be used as a primary standard for standardizing potassium permanganate (KMnO4) solutions.
The mineral form of sodium oxalate is natroxalate. It is only very rarely found and restricted to extremely sodic conditions of ultraalkaline pegmatites. | [Chemical Properties]
White, crystalline powder. Soluble in water; insolu-
ble in alcohol.
| [Definition]
ChEBI: An organic sodium salt consisting of sodium and oxalate ions in a 2:1 ratio. | [Reactions]
Sodium oxalate is used to standardize potassium permanganate solutions. It is desirable that the temperature of the titration mixture is greater than 60 °C to ensure that all the permanganate added reacts quickly. The kinetics of the reaction is complex, and the manganate (II) ions formed catalyze the further reaction between permanganate and oxalic acid (formed in situ by the addition of excess sulfuric acid). The final equation is as follows:
5Na2C2O4 + 2KMnO4 + 8H2SO4 → K2SO4 + 2MnSO4 + 10CO2 + 8H2O. | [Toxicology]
Like several other oxalates, sodium oxalate is toxic to humans. It can cause burning pain in the mouth, throat and stomach, bloody vomiting, headache, muscle cramps, cramps and convulsions, drop in blood pressure, heart failure, shock, coma, and possible death. Mean lethal dose by ingestion of oxalates is 10-15 grams (per MSDS).
Sodium oxalate, like citrates, can also be used to remove calcium ions (Ca2+) from blood plasma. It also prevents blood from clotting. Note that by removing calcium ions from the blood, sodium oxalate can impair brain function, and deposit calcium oxalate in the kidneys. | [Purification Methods]
It crystallises from hot water (16mL/g) by cooling to 0o. Before use as a volumetric standard, analytical grade quality sodium oxalate should be dried for 2hours at 120o and allowed to cool in a desiccator. [Beilstein 2 IV 1819.] |
| Questions And Answer | Back Directory | [Physical Properties]
White crystalline powder; density 2.34 g/cm3; decomposes around 250° C; sparingly soluble in water, 3.7 g/100 mL at room temperature; moderately soluble in boiling water, about 6.25 g/100 mL; the aqueous solution is practically neutral; insoluble in alcohol
| [Uses]
Sodium oxalate is used as an analytical standard for standardization of potassium permanganate and other strong oxidizing agents. It also is used in finishing textiles, tanning leather, and blue printing.
| [Preparation]
Sodium oxalate can be made by heating sodium formate at about 250°C:
2HCOONa → Na2C2O4 + H2
It also can be prepared by reacting oxalic acid with a dilute aqueous solution of sodium hydroxide followed by evaporation and crystallization.
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