Oxalic Acid

Oxalic acid

Ethanedioic acid;Oxalic acid;Aktisal;Aquisal;NSC 132055;NSC 151956;NSC 62774;NSC 76990;Ultraplast Activate S 52;DeerClean;Ethanedioic acid,conjugate acid (1:2);63504-28-9;97993-78-7;216451-38-6;2469072-60-2

144-62-7

C2H2O4

InChIKey=MUBZPKHOEPUJKR-UHFFFAOYSA-N

90.034

90.03

208-932-1

9E7R5L6H31

0529

62774

3261|1759

DTXSID0025816

ANHYDROUS OXALIC ACID, CRYSTALLIZED FROM GLACIAL ACETIC ACID IS ORTHORHOMBIC, CRYSTALS BEING PYRAMIDAL OR ELONGATED OCTAHEDRA|Colorless powder or granular solid [Note: The anhydrous form (COOH)2 is a white powder].

2917111000

74.6

-0.3

Oxalic acid is an odorless white solid. Sinks and mixes with water. (USCG, 1999)

1.9 g/cm³

189.5 °C (decomp)

200 °C @ Press: 0.1 Torr

188.8±19.7 °C

1.480

14%

STORE IN COOL, DRY, WELL-VENTILATED LOCATION. /OXALIC ACID DIHYDRATE/

<0.001 mmHg

4.3

Combustible Solid

Odorless.

1.43e-10 atm-m3/mole|Henry's Law constant: 1.4X10-10 atm-cu m/mole at 25 °C (experimental)

pKa 1: 1.46; pKa 2: 4.40

MP: 101-102 °C GIVING OFF WATER OF CRYSTALLIZATION & STARTING TO SUBLIME; K1= 5.36X10-2; K2= 5.3X10-5; DENSITY: 1.653 @ 18.5 °C/4 °C; DENSITY OF 1% (WT/WT) AQ SOLN: 1.0035 @ 17.5 °C/4 °C; DENSITY OF 3% (WT/WT) AQ SOLN: 1.0105 @ 17.5 °C/4 °C; DENSITY OF 5% (WT/WT) AQ SOLN: 1.0175 @ 17.5 °C/4 °C; DENSITY OF 10% (WT/WT) AQ SOLN: 1.0350 @ 17.5 °C/4 °C; DENSITY OF 13% (WT/WT) AQ SOLN: 1.0455 @ 17.5 °C/4 °C /OXALIC ACID DIHYDRATE/|DISSOCIATION CONSTANT: 6.5X10-2 /OXALIC ACID DIHYDRATE/|SUBLIMES BEST @ 157 °C; @ HIGHER TEMP DECOMP INTO CO2, CARBON MONOXIDE, FORMIC ACID, & WATER; HYGROSCOPIC|MONOCLINIC TABLETS, PRISMS, OR GRANULES; 1 G DISSOLVES IN 7 ML WATER; 1 G DISSOLVES IN 2 ML BOILING WATER; 1 G DISSOLVES IN 2.5 ML ALCOHOL; 1 G DISSOLVES IN 1.8 ML BOILING ALCOHOL; 1 G DISSOLVES IN 100 ML ETHER; 1 G DISSOLVES IN 5.5 ML GLYCEROL /OXALIC ACID DIHYDRATE/|Transparent, colorless crystals or white powder /Oxalic acid dihydrate/|Odorless /Oxalic acid dihydrate/|For more Other Experimental Properties (Complete) data for OXALIC ACID (6 total), please visit the HSDB record page.

Water soluble. Hygroscopic

Acids, Carboxylic

OXALIC ACID is hygroscopic and sensitive to heat. This compound may react violently with furfuryl alcohol, silver, sodium, perchlorate, sodium hypochlorite, strong oxidizers, sodium chlorite, acid chlorides, metals and alkali metals. (NTP, 1992). The heating of mixtures of Oxalic acid and urea has lead to explosions. This is due to the rapid generation of the gases CO2, CO, and NH3 [Praxis Naturwiss. Chem., 1987, 36(8), 41-42]. Oxalic acid and urea react at high temperatures to form toxic and flammable ammonia and carbon monoxide gases, and inert CO2 gas [Von Bentzinger, R. et al., Praxis Naturwiss. Chem., 1987, 36(8), 41-42].

Not flammable (USCG, 1999)

-245.61 KJ/mol

Combustible Solid