Ethanedioic acid, potassium salt (2:1)
Basic information
- CAS
127-96-8- Standard SMILES
O=C(O)C(=O)O.O=C([O-])C(=O)O.[K+]- InChIKey
GANDVAJEIJXBQJ-UHFFFAOYSA-M- Molecular formula
- C4H3KO8
- Average molar mass
- 218.16 g/mol
- Monoisotopic mass
- 217.94649853
Overview
See also: Potassium trihydrogen dioxalate, dihydrate (annotation moved to).
Names & identifiers
- Preferred name
- Ethanedioic acid, potassium salt (2:1)
- IUPAC
- potassium;2-hydroxy-2-oxoacetate;oxalic acid
- English name
- potassium trihydrogen dioxalate
- Molecular formula
- C2H4K2O6
- Molecular weight
- 202.24616
Names & synonyms
Potassium trihydrogen dioxalatePotassium Tetraoxalate127-96-8Ethanedioic acid, potassium salt (2:1)UNII-OQ8R5Z714TPotassium tetraoxalate dihydrateOxalic acid hemipotassium saltKaliumtetraoxalatC4H3KO8SCHEMBL5517108DTXSID30889421MFCD00036364
Show more names
Einecs 204-874-6Tetraoxalate potassiumPotassium Oxalate, >98%Potassium hydrogen oxalaPotassiumTetraoxalateA.R.POTASSIUMTETRAOXALATE,REAGENTPotassiumOxalateK2C2O4*H2O>98%Potassium trihydrogen oxalate?Oxalic acid potassium salt (2:1)
P0475potassium;2-hydroxy-2-oxoacetate;oxalic acidpotassium;2-hydroxy-2-oxo-acetate;oxalic acidQ9352834Potassium hydrogen ethanedioate--oxalic acid (1/1/1)
Database identifiers
- CAS
127-96-8、6100-20-5- PubChem CID
- 22474
- DTXSID
DTXSID30889421- EC Number
- 204-874-6
Properties
Computed structural properties
- Topological polar surface area
- 152 Ų
- Hydrogen bond donors
- 3
- Hydrogen bond acceptors
- 8
- Rotatable bonds
- 2
- Heavy atoms
- 13
- Formal charge
- 0
- Complexity
- 159
Experimental & physicochemical properties
Chemical ClassesMetals -> Organic Acids, Metal Salts
Physical DescriptionDihydrate: Colorless or white solid; [Merck Index] Colorless or white crystals; [Mallinckrodt Baker MSDS]
Physicochemical properties
- Melting point
- 10 · decomposes [CRC10]
- Density
- 1.875 · 1.875[at 20℃]
- vapor pressure
- 0 Pa · 0Pa at 20℃
- Water Solubility
- 60 parts · soluble 60 parts cold H2O, 12 parts boiling H2O; slightly soluble alcohol [MER06]
- FDA UNII
- 3 A94F29J · KJ3A94F29J
- EPA Substance Registry System
- Ethanedioic acid, potassium salt (2:1) (127-96-8)
- Symbol(GHS)
- 7 · GHS07,GHS05
- Signal word
- Danger
- Hazard statements
- 312 · H312-H302
- Precautionary statements
- 280 · P280-P302+P352-P312-P322-P363-P501-P264-P270-P301+P312-P330-P501
Safety & regulation
Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.
GHS classification
GHS Classification
Warning
H302 (100%): Harmful if swallowed [Warning Acute toxicity, oral]
P264, P270, P280, P301+P317, P302+P352, P317, P321, P330, P362+P364, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 14 reports by companies from 4 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Danger
H302: Harmful if swallowed [Warning Acute toxicity, oral]
Hazard information
Regulatory Information
Chemical: Ethanedioic acid, potassium salt (2:1)
REACH registered substance: Potassium trihydrogen dioxalate (EC: 204-874-6)
Other Safety InformationIMAP assessments - Oxalic acid soluble salts: Human health tier II assessment
Hazards SummaryThe dihydrate is CAS# 6100-20-5; May cause irritation; [Mallinckrodt Baker MSDS] May cause irritation; Inhalation or ingestion may cause cardiac disturbances and CNS depression; [Acros Organics MSDS] See Oxalic acid.
Hazard Classes and Categories
Acute Tox. 4 (100%)
Acute toxicity - category 4
Safety data
- tsca
- TSCA listed
- Signal word
- Danger
- Symbol(GHS)
- GHS07,GHS05
- Hazard statements
- H312-H302
- REACH Registrations
- Active
Chemistry & industry
Uses & manufacturing
UsesUsed as a chemical reagent and in spot removers and metal polishes; [Merck Index]
General Manufacturing InformationEthanedioic acid, potassium salt (2:1): ACTIVE
Applications
OccurrencePotassium oxalate, along with calcium oxalate, is found in leaves and roots of certain plants. It is used for cleaning and bleaching straw and for removing stains. It also is used in photography, in clinical tests, as a secondary pH standard, and in wet chemical analysis. The analytical application involves standardization of many oxidizing agents in titrimetric analysis.
Preparation methods
PreparationPotassium oxalate can be preparaed by heating potassium formate at 360°C:2HCOOK →K2C2O4+ H2The salt is obtained as its monohydrate by neutralization of oxalic acid with a dilute aqueous solution of potassium hydroxide followed by crystallization:H2C2O4+ 2KOH →K2C2O4+ 2H2O.
Related reactions
0 records
No reaction records under the current filter.
Compound notes
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