6487-48-5

Basic information

• Product Name: Potassium oxalate monohydrate
• Synonyms: OXALIC ACID, DIPOTASSIUM SALT MONOHYDRATE;OXALIC ACID POTASSIUM SALT;OXALIC ACID POTASSIUM SALT MONOHYDRATE;POTASSIUM OXALATE-1-HYDRATE;POTASSIUM OXALATE H2O;POTASSIUM OXALATE, HYDROUS;POTASSIUM OXALATE MONOHYDRATE;DI-POTASSIUM OXALATE MONOHYDRATE
• CAS NO: 6487-48-5
• Molecular Formula: C₂O₄*H₂O*2K
• Molecular Weight: 184.23
• EINECS: 209-506-8
• Product Categories: Biochemicals and Reagents;Building Blocks;Carbonyl Compounds;Carboxylic Acid Salts;Chelators;Chemical Synthesis;Organic Building Blocks;Analytical reagent
• Mol File: 6487-48-5.mol
• Article Data: 0

Chemical Properties

• Melting Point: 356 °C
• Boiling Point: 365.1 °C at 760 mmHg
• Flash Point: 188.8 °C
• Appearance: White/Crystals or Flakes
• Density: 2.127
• Vapor Pressure: <0.1 hPa (20 °C)
• Storage Temp.: Store at RT.
• Solubility: H2O: 1 M at 20 °C, clear, colorless
• Water Solubility: 364 g/L (20 ºC)
• Sensitive: Hygroscopic
• Stability: Stable. Incompatible with strong oxidizing agents. Protect from moisture.
• Merck: 14,7651
• BRN: 3752576
• CAS DataBase Reference: Potassium oxalate monohydrate(CAS DataBase Reference)
• NIST Chemistry Reference: Potassium oxalate monohydrate(6487-48-5)
• EPA Substance Registry System: Potassium oxalate monohydrate(6487-48-5)

Safety Data

• Hazard Codes: Xn
• Statements: 21/22
• Safety Statements: 24/25
• RIDADR: 3282
• WGK Germany: 1
• RTECS: RO2885000
• TSCA: Yes
• HazardClass: 6.1
• PackingGroup: III
• Hazardous Substances Data: 6487-48-5(Hazardous Substances Data)

Usage

Description

Potassium oxalate monohydrate is the monohydrate form of potassium oxalate. It is a strong dicarboxylic acid naturally occurring in many plants and vegetables. It is produced inside the body during the metabolism of glyoxylic acid or ascorbic acid. It is used as a chelating agent, a purifying agent in the pharmaceutical industry as well as a precipitating agent in rare-earth metal processing. In textile and wood industry, it can also used as a grinding agent, a rust remover in metal treatment and a bleaching agent. Moreover, it can be used as a scale remover in automobile radiators and also used in water treatment. In addition, it can be used to determine the calcium content and other heavy metals and reducing agents inn analytic chemistry. It can also be used for the preparation of SBA-15 (nanostructured SiO2) supported catalyst.

References

https://www.alfa.com/en/catalog/A12289/ https://pubchem.ncbi.nlm.nih.gov/compound/Potassium_oxalate#section=Top

Chemical Properties

Different sources of media describe the Chemical Properties of 6487-48-5 differently. You can refer to the following data:
1. Potassium oxalate, K2C204, H20, is odorless, effiorescent, water-soluble, colorless crystals that decompose when heated.Usedin analytical chemistry and photography, and as a bleach and oxalic acid source,
2. The monohydrate, K2C2O4·H20, mol wt 184.24,is produced as a colorless crystalline material or a white powder.

Uses

Different sources of media describe the Uses of 6487-48-5 differently. You can refer to the following data:
1. Potassium Oxalate Monohydrate is a useful chelator.
2. Potassium oxalate monohydrate may be used in the preparation of SBA-15 (Santa Barbara Amoprhous-15)- catalyst.

General Description

Potassium oxalate monohydrate (POM) is a potassium salt of oxalic acid. Its crystal structure has been investigated by three-dimensional neutron diffraction studies.

Purification Methods

Recrystallise it from hot water. It forms various K + oxalic acid salts [e.g. potassium hydrogen oxalate KH(C2O4)—see above, and KH3(C2O4)2 which is, surprisingly, called potassium tetraoxalate—see below]. [Beilstein 2 H 513, 2 I 224, 2 II, 485, 2 III 1552, 2 IV 1823.]

InChI:InChI=1/C2H2O4.2K/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);;/q;2*+1/p-2

Synthetic route

methylammonium carbonate (15719-64-9, 15719-76-3, 97762-63-5) → potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
With amalgamated potassium at 360℃;

methylammonium carbonate (15719-64-9, 15719-76-3, 97762-63-5) → potassium oxalate monohydrate (6487-48-5) + alkali formate/s

Conditions	Yield
With potassium hydride at 80℃;

oxalic acid (144-62-7) + potassium carbonate (584-08-7) → potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
In not given neutralisation;
In not given neutralisation;

potassium hydrogenoxalate (127-95-7, 127-96-8, 583-52-8, 10043-22-8, 20700-38-3) + potassium carbonate (584-08-7) → potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
In not given neutralisation;
In not given neutralisation;

oxalic acid (144-62-7) + potassium hydroxide → potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
In not given neutralisation;
In not given neutralisation;

potassium hydrogenoxalate (127-95-7, 127-96-8, 583-52-8, 10043-22-8, 20700-38-3) + potassium hydroxide → potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
In not given neutralisation;
In not given neutralisation;

water (7732-18-5) + potassium oxalate monoperhydrate → dihydrogen peroxide (7722-84-1) + potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
In neat (no solvent) Kinetics; 20°C, varying partial pressure of water and H2O2;

+ potassium oxalate monohydrate (6487-48-5) → [Cu(2-(2-pyridyl)imidazole)(oxalate)(H2O)]*2H2O

[2-(2-pyridyl)imidazole]copper(II) nitrate + potassium oxalate monohydrate (6487-48-5) → [Cu(2-(2-pyridyl)imidazole)(oxalate)(H2O)]*2H2O

Conditions	Yield
In water prepn. by slow diffusion in H-shaped tube of aq. solns. contg. K2C2O4*H2O in one arm and (2-(2-pyridyl)imidazole)copper(II) nitrate in the other; diffusion is complete in one mo; elem. anal.;	99%

copper(ll) sulfate pentahydrate + potassium oxalate monohydrate (6487-48-5) → dipotassium bisoxalato copper(II) dihydrate

Conditions	Yield
In water heating 0.05 mol soln. of sulfate in water at 90°C; addn. of 0.2 mol oxalate soln.; filtration at 10°C;; ppt. washed with water and at 50°C about 12 h dried;;	97%
In water heating 0.05 mol soln. of sulfate in water at 90°C; addn. of 0.2 mol oxalate soln.; filtration at 10°C;; ppt. washed with water and at 50°C about 12 h dried;;	97%

[ruthenium(II)(η6-1-methyl-4-isopropyl-benzene)(chloride)(μ-chloride)]2 (52462-29-0) + potassium oxalate monohydrate (6487-48-5) → [(p-cymene)2Ru2(μ-η4-C2O4)]Cl2 (201336-17-6, 1185317-98-9, 201425-24-3)

Conditions	Yield
In methanol; chloroform at 20℃; for 18h; Reflux;	96%

[2,2]bipyridinyl (366-18-7) + copper(II) nitrate trihydrate + potassium oxalate monohydrate (6487-48-5) → [(copper(II)(nitrate)(2,2'-bipyridine)(H2O))2(μ-oxalate)] (226998-72-7, 94069-86-0)

Conditions	Yield
In water stirring (60°C, 1 h); filtn., recrystallization (water); elem. anal.;	95%

copper(II) nitrate trihydrate + potassium oxalate monohydrate (6487-48-5) → 2C2O4(2-)*2K(1+)*Cu(2+)*4H2O

Conditions	Yield
In water at 20 - 90℃; for 24h;	95%

2,2'-biimidazole (492-98-8) + copper(II) nitrate trihydrate + potassium oxalate monohydrate (6487-48-5) → [Cu(2,2'-biimidazole)(oxalate)(H2O)]*H2O (670227-93-7)

Conditions	Yield
In water prepn. by slow diffusion in H-shaped tube of aq. solns. contg. K2C2O4*H2O in one arm and a mixt. of Cu(NO3)2*3H2O and 2,2'-biimidazole in the other; elem. anal.;	90%

4-amino-1,2,4-triazole (584-13-4) + potassium oxalate monohydrate (6487-48-5) + nickel(II) oxalate dihydrate (20161-19-7, 34729-05-0) → [Ni(μ-ox)(4-amino-1,2,4-triazole)2]n

Conditions	Yield
In water soln. (10 ml) of (C2H2N3)NH2 (2.00 mmol) added dropwise to soln. (10 ml)of Ni(C2O4)*2H2O (0.44 mmol) and K2C2O4*H2O (2.4 mmol); elem. anal.;	90%

4-amino-1,2,4-triazole (584-13-4) + potassium oxalate monohydrate (6487-48-5) + cobalt(II) oxalate dihydrate (14646-43-6, 62782-24-5) → [Co(μ-ox)(4-amino-1,2,4-triazole)2]n

Conditions	Yield
In water soln. (10 ml) of (C2H2N3)NH2 (2.00 mmol) added dropwise to soln. (10 ml)of Co(C2O4)*2H2O (0.44 mmol) and K2C2O4*H2O (4.00 mmol); elem. anal.;	90%

[zinc(3,14-dimethyl-2,6,13,17-tetraazatricyclo(16.4.0.07,12)docosane)(nitrate)2] + potassium oxalate monohydrate (6487-48-5) → ([Zn(5,16-dimethyl-2,6,13,17-tetraazatricyclo[16.4.0(1,18).0(7,12)]docosane)(oxalate)2]*3.5H2O)n

Conditions	Yield
In water; N,N-dimethyl-formamide aq. soln. of K salt added to soln. of Zn compd. in DMF; evapd. slowly; elem. anal.;	90%

(3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,0(1.18),0(7.12)]docosane)zinc(II) nitrate + water (7732-18-5) + potassium oxalate monohydrate (6487-48-5) + N,N-dimethyl-formamide (68-12-2, 33513-42-7) → (3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,0(1.18),0(7.12)]docosane)copper(II)(μoxalate)zinc(II) trihydrate semidimethylsulfoxide

Conditions	Yield
In water; N,N-dimethyl-formamide aq. soln. of K2C2O4*H2O added to a DMF soln. of Zn complex (1 equiv.); crystd., elem. anal.;	90%

(3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,0(1.18),0(7.12)]docosane)copper(II)di(perchlorate) + water (7732-18-5) + potassium oxalate monohydrate (6487-48-5) → (3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,0(1.18),0(7.12)]docosane)copper(II)(μoxalate)copper(II) pentahydrate

Conditions	Yield
In water; N,N-dimethyl-formamide DMF soln. of Cu complex treated with 1 equiv. of K2C2O4*H2O in H2O; crystd. (air) at ambient temp. for 1 week, elem. anal.;	90%

sodium tetrachloropalladate(II) + tris(bipyridine)ruthenium(II) dichloride hexahydrate + potassium oxalate monohydrate (6487-48-5) → [tris(2,2'-bipyridine)ruthenium(II)][Pd2(oxalate)3]

Conditions	Yield
In water byproducts: NaCl, KCl; an aq. soln. of Na2PdCl4 was added dropwise to an aq. soln. of Ru-complex and K2C2O4*H2O, 60 min; ppt. was filtered off, washed with water, air-dried; elem. anal.;	89.8%

C34H49Cl4Ir3N4 + silver trifluoromethanesulfonate (2923-28-6) + potassium oxalate monohydrate (6487-48-5) → C72H98Ir6N8O8(4+)*4CF3O3S(1-)

Conditions	Yield
Stage #1: C34H49Cl4Ir3N4; silver trifluoromethanesulfonate In methanol at 20℃; for 3h; Darkness; Stage #2: potassium oxalate monohydrate In methanol for 8h;	88%

cis-dichlorobis(triethylphosphine)platinum(II) (13965-02-1, 14177-93-6, 15692-07-6) + potassium oxalate monohydrate (6487-48-5) → bis(triethylphosphine)(oxalato)platinum(II) (81457-59-2)

Conditions	Yield
In methanol; water Pt complex and potassium oxalate mixing in equal volumes of hot MeOH and water, concg., cooling, off-white crystals sepg.; purified by recrystn. from CH2Cl2/Et2O; identified by elem. anal., NMR, IR and UV spectra;	85%

piperazine (110-85-0) + potassium oxalate monohydrate (6487-48-5) + copper(l) chloride → (piperazine)copper(II) oxalate (753457-07-7)

Conditions	Yield
With air In water byproducts: K2Cu(oxalate)2*2H2O; Cu:ox:piperazine=1.10:10.86:11.61 reacted for 6 d; ppt. filtered; elem. anal.;	85%

pyrazine-2,3-diamine (13134-31-1) + bis[dichloro(pentamethylcyclopentadienyl)iridium(III)] (12354-84-6, 12354-85-7) + potassium oxalate monohydrate (6487-48-5) → C34H49Cl4Ir3N4

Conditions	Yield
In methanol at 20℃; for 3h;	85%

cis-dichlorobis(triethylphosphine)platinum(II) (13965-02-1, 14177-93-6, 15692-07-6) + potassium oxalate monohydrate (6487-48-5) → bis(triethylphosphine)(oxalato)platinum(II) (81457-59-2)

Conditions	Yield
In methanol; water byproducts: KCl; heated with stirring until all solids dissolved, further heated for 10 min; concd., cooled (several h), collected, washed (2xH2O), dried under vacuum for 12 h, recrystd. (CH2Cl2), filtered, Et2O added, several h at 25°C, crystd., cooled to -10°C for 16 h, collected, washed (Et2O), dried in vacuo (1 h), elem. anal.;	84%

sodium tetrachloropalladate(II) + manganese(II) chloride tetrahydrate + tris(bipyridine)ruthenium(II) dichloride hexahydrate + potassium oxalate monohydrate (6487-48-5) → [tris(2,2'-bipyridine)ruthenium(II)][PdMn(oxalate)3]

Conditions	Yield
In water byproducts: NaCl, KCl; an aq. soln. of Na2PdCl4 and MnCl2*4H2O was added dropwise to an aq. soln. of Ru-complex and K2C2O4*H2O, 60 min; ppt. was filtered off, washed with water, air-dried; elem. anal.;	83.4%

osmium(VIII) oxide (20816-12-0) + 1,10-Phenanthroline (66-71-7) + hydroxylamine hydrochloride (5470-11-1) + potassium oxalate monohydrate (6487-48-5) → 1,10-phenanthrolinedium pentabromonitrosylosmate

Conditions	Yield
With HBr In water stirring at 70-80°C for 1 h, then cooling to 10°C, adjustment of pH to ca 4.5, then addn. of concd. HBr, boiling for 1.5 h, cooling to room temp., then addn. of a hot (70°C) aq. soln. of C12H8N2, stirring for 45 min at 25°C; filtration, drying in vac., washing with benzene, drying under P4O10 in vac. for 24 h, elem. anal.;	83%

Adipic acid (124-04-9) + potassium oxalate monohydrate (6487-48-5) + oxalic acid (144-62-7) + zinc(II) oxide → K2(H2adp)[Zn2(ox)3]*3H2O

Conditions	Yield
With polytetrafluoroethylene In water at 20 - 130℃; for 202h; Autoclave;	83%

manganese(II) chloride tetrahydrate + [ΛRu(2,2'-bipyridine)3]I2*6H2O + potassium oxalate monohydrate (6487-48-5) → ([Ru(II)Λ(bpy)3][Mn(II)Λ2(oxalate)3])n

Conditions	Yield
With LiCl In water addn. of MnCl2 to mixt. of Ru-complex and LiCl (stirring), addn. of K2C2O4 (pptn. after few min); collection (filtration), washing (water, EtOH), drying in air; elem. anal.;	81%

4-aminopyridine (504-24-5) + potassium oxalate monohydrate (6487-48-5) + cobalt(II) oxalate dihydrate (14646-43-6, 62782-24-5) → (Co(μ-oxalate)(4-aminopyridine)2)

Conditions	Yield
In methanol; water react. MeOH soln. 4-ampy with aq. soln. Co(ox)*2H2O and K2(ox)*H2O; elem. anal.;	80%

potassium oxalate monohydrate (6487-48-5) + tin(IV) chloride (7646-78-8) → potassium-μ-oxalato-di[trisoxalatostannate(IV)] tetrahydrate

Conditions	Yield
In water addn. of SnCl4 to 3.5-4 equiv. of K2C2O4 soln., heating to 70°C; EtOH addn., crystn. (cooling), filtration (ice-cold EtOH, ice-cold Et2O), recrystn. (aq. EtOH), drying (70°C); elem. anal.;	80%

4-amino-1,2,4-triazole (584-13-4) + potassium oxalate monohydrate (6487-48-5) + potassium bis(oxalato)cuprate(II) dihydrate → [Cu(μ-ox)(4-amino-1,2,4-triazole)2]n

Conditions	Yield
In methanol; water MeOH soln. of (C2H2N3)NH2 (2.5 mmol) layered onto aq. soln. of K2Cu(C2O4)2*2H2O (0.5 mmol) and K2C2O4*H2O (0.33 mmol); kept (2 wk); washed with cold H2O and Et2O; dried in air; elem. anal.;	80%

manganese (II) nitrate tetrahydrate + potassium oxalate monohydrate (6487-48-5) + trans-1,2-bis(4-pyridyl)ethylene (1135-32-6) → [Mn2(μ-oxalato)2(μ-1,2-bis(4-pyridyl)ethylene)(1,2-bis(4-pyridyl)ethylene)2]

Conditions	Yield
In methanol; water aq. soln. of K oxalate added to MeOH-H2O soln. of NC5H4CHCHC5H4N and Mn salt (molar ratio 1:1:3); ppt. collected; elem. anal.;	80%

[Pd(C,N-κ2-C6H4CH=NC6H3-2,6-i-Pr2)(μ-Cl)]2 (710294-09-0) + potassium oxalate monohydrate (6487-48-5) → C40H44N2O4Pd2 (1607816-89-6)

Conditions	Yield
Stage #1: [Pd(C,N-κ2-C6H4CH=NC6H3-2,6-i-Pr2)(μ-Cl)]2 With silver nitrate In acetonitrile at 20℃; for 15h; Darkness; Stage #2: potassium oxalate monohydrate In dichloromethane; water at 20℃; for 16h; Schlenk technique;	80%

[(C6F5)2Pt(μ-PPh2)2Pt(CH3CN)2] (881073-95-6) + tetrabutylammonium perchlorate (1923-70-2) + potassium oxalate monohydrate (6487-48-5) → [NBu4]2[{(C6F5)2Pt(μ-PPh2)2Pt}2(μ-C2O4-κ2O,O′:κ2O″,O‴)]

Conditions	Yield
In acetone at 20℃; for 20h;	77%

zirconyl chloride octahydrate + oxalic acid dihydrate (6153-56-6) + potassium oxalate monohydrate (6487-48-5) + potassium hydroxide → K6[(Zr(C2O4)3)2(μ-C2O4)] * 4 H2O

Conditions	Yield
In water molar ratio Zr:oxalic acid:K2C2O4=1:3:1, pH-adjustment to 1.5 (0.1 M KOH), stirring at 80°C for 12 h; filtration, crystn. (closed vessel, room temp., 2 months), collection (filtration), washing (cold water), drying (vac., 6 h); elem. anal.;	75%

copper(II) nitrate trihydrate + 2,3-bis(2-pyridyl)quinoxaline (23309-74-2) + water (7732-18-5) + potassium oxalate monohydrate (6487-48-5) → [copper(II) bis(2-pyridyl)quinoxaline (oxalate)(aqua)] pentahydrate

Conditions	Yield
In ethanol; water ligand added to Cu salt in H2O/EtOH 80:20 v/v, gently refluxed for 15 min, treated with K2Ox*H2O while stirring; evapd. at room temp., elem. anal.;	75%

Upstream product

• 15719-64-9 methylammonium carbonate 
• 144-62-7 oxalic acid 
• 127-95-7 potassium hydrogenoxalate 
• 7732-18-5 water 
• 584-08-7 potassium carbonate 

Downstream Products

• 463-79-6 carbonic-acid 
• 584-08-7 potassium carbonate 
• 7439-89-6 iron 
• 7440-02-0 nickel 
• 7439-92-1 lead 
• 7440-48-4 cobalt 
• 23697-36-1 bis(triphenylphosphine)(oxalato)platinum(II) 
• 1607816-89-6 C₄₀H₄₄N₂O₄Pd₂