Thorium oxalate

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Thorium oxalate
ECHA InfoCard 100.016.400
EC Number 218-038-3
PubChem CID
Molar mass 408.07 g/mol
444.114 g/mol (dihydrate)
Density 4.637 g/cm3 (anhydrous)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Thorium oxalate is a white insoluble compound of thorium that is prepared by mixing a thorium nitrate solution in acid medium with an oxalic acid solution.

Thorium Chemical element with atomic number 90

Thorium is a weakly radioactive metallic chemical element with symbol Th and atomic number 90. Thorium is silvery and tarnishes black when it is exposed to air, forming thorium dioxide; it is moderately hard, malleable, and has a high melting point. Thorium is an electropositive actinide whose chemistry is dominated by the +4 oxidation state; it is quite reactive and can ignite in air when finely divided.

Oxalic acid simplest dicarboxylic acid

Oxalic acid is an organic compound with the formula C2H2O4. It is a colorless crystalline solid that forms a colorless solution in water. Its condensed formula is HOOCCOOH, reflecting its classification as the simplest dicarboxylic acid.

By mixing 0.5 M thorium nitrate solution with 0.5 M oxalic acid solution at room temperature thorium oxalate dihydrate ( Th(C2O4)2.2H2O ) is obtained. Thorium oxalate hexahydrate is obtained when precipitated from 2 M nitric acid solution. On heating to 500° it is converted to thorium oxide. [1] The solubility product (Ksp) of thorium oxalate is 5.01 X 10−25 [2] Density of anhydrous thorium oxalate is 4.637 g/cm3.

In chemistry, a hydrate is a substance that contains water or its constituent elements. The chemical state of the water varies widely between different classes of hydrates, some of which were so labeled before their chemical structure was understood.

Nitric acid (HNO3), also known as aqua fortis (Latin for "strong water") and spirit of niter, is a highly corrosive mineral acid.

Thorium dioxide chemical compound

Thorium dioxide (ThO2), also called thorium(IV) oxide, is a crystalline solid, often white or yellow in color. Also known as thoria, it is produced mainly as a by-product of lanthanide and uranium production. Thorianite is the name of the mineralogical form of thorium dioxide. It is moderately rare and crystallizes in an isometric system. The melting point of thorium oxide is 3300 °C – the highest of all known oxides. Only a few elements (including tungsten and carbon) and a few compounds (including tantalum carbide) have higher melting points. All thorium compounds are radioactive because there are no stable isotopes of thorium.

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Actinide chemical elements

The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium.

Lutetium Chemical element with atomic number 71

Lutetium is a chemical element with symbol Lu and atomic number 71. It is a silvery white metal, which resists corrosion in dry air, but not in moist air. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. Lutetium is sometimes considered the first element of the 6th-period transition metals, although lanthanum is more often considered as such.


Oxalate (IUPAC: ethanedioate) is the dianion with the formula C
, also written (COO)2−
. Either name is often used for derivatives, such as salts of oxalic acid, for example sodium oxalate Na2C2O4, or dimethyl oxalate ((CH3)2C2O4). Oxalate also forms coordination compounds where it is sometimes abbreviated as ox.

Sodium oxalate chemical compound

Sodium oxalate, or disodium oxalate, is the sodium salt of oxalic acid with the formula Na2C2O4. It is a white, crystalline, odorless solid, that decomposes above 290 °C.

Americium dioxide (AmO2) is a black compound of americium. In the solid state AmO2 adopts the fluorite, CaF2 structure. It is used as a source of alpha particles.

Uranyl chloride, UO2Cl2 is an unstable, bright yellow coloured chemical compound of uranium. It forms large sand-like crystals which are highly soluble in water, alcohols, and ethers. Uranyl chloride and its two hydrates, UO2Cl2·H2O and UO2Cl2·3H2O, decompose in the presence of light, a fact discovered by Adolph Gehlen in 1804. This photosensitivity periodically attracted scientific curiosity and various unsuccessful attempts to develop photographic applications using the salts. As with most other uranic species this compound also exhibits fluorescence.

Barium oxalate chemical compound

Barium oxalate (BaC2O4), a barium salt of oxalic acid, is a white odorless powder that is sometimes used as a green pyrotechnic colorant generally in specialized pyrotechnic compositions containing magnesium.

Silver oxalate chemical compound

Silver oxalate is commonly employed in experimental petrology to add carbon dioxide to experiments as it will break down to silver (Ag) and carbon dioxide under geologic conditions. It is also a precursor to the production of silver nanoparticles. It is explosive upon heating around 140 degrees Celsius, shock or friction.

Barium bromide is the chemical compound with the formula BaBr2. Like barium chloride, it dissolves well in water and is toxic in aqueous solution.

Crystal arthropathy is a class of joint disorder that is characterized by accumulation of tiny crystals in one or more joints. Polarizing microscopy and application of other crystallographic techniques have improved identification of different microcrystals including monosodium urate, calcium pyrophosphate dihydrate, calcium hydroxyapatite, and calcium oxalate.

Isosaccharinic acid chemical compound

Isosaccharinic acid (ISA) is a six-carbon sugar acid which is formed by the action of calcium hydroxide on lactose and other carbohydrates. It is of interest because it may form in intermediate-level nuclear waste stores when cellulose is degraded by the calcium hydroxide in cements such as Portland cement. The calcium salt of the alpha form of ISA is very crystalline and quite insoluble in cold water, but in hot water it is soluble.

Cerium Chemical element with atomic number 58

Cerium is a chemical element with symbol Ce and atomic number 58. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. Cerium is the second element in the lanthanide series, and while it often shows the +3 oxidation state characteristic of the series, it also exceptionally has a stable +4 state that does not oxidize water. It is also considered one of the rare-earth elements. Cerium has no biological role and is not very toxic.

Potassium hydrogenoxalate chemical compound

Potassium hydrogenoxalate, also known as potassium bioxalate, is a salt with formula KHC2O4 or K+·HO2C-CO2. It is one of the most common salts of the hydrogenoxalate anion, and can be obtained by reacting potassium hydroxide with oxalic acid in 1:1 mole ratio.

Acetic oxalic anhydride chemical compound

Acetic oxalic anhydride is an organic compound with a chemical formula of C
and a structural formula of (H3C-(C=O)-O-(C=O)-)2. It can be viewed as a mixed anhydride, formally derived from acetic acid (H3C-(C=O)OH) and oxalic acid ((-(C=O)OH)2), in 2:1 molecular ratio, by the loss of two water molecules.

Magnesium oxalate chemical compound

Magnesium oxalate is an inorganic compound comprising a magnesium cation with a 2+ charge bonded to an oxalate anion. It has the chemical formula MgC2O4. Magnesium oxalate is a white solid that comes in two forms: an anhydrous form and a dihydrate form where two water molecules are complexed with the structure. Both forms are practically insoluble in water and are insoluble in organic solutions.

Cerium nitrate

Cerium nitrate refers to a family of nitrates of cerium in the three or four oxidation state. Often these compounds contain water, hydroxide, or hydronium ions in addition to cerium and nitrate. Double nitrates of cerium also exist.

Actinide chemistry branch of nuclear chemistry

Actinide chemistry is one of the main branches of nuclear chemistry that investigates the processes and molecular systems of the actinides. The actinides derive their name from the group 3 element actinium. The informal chemical symbol An is used in general discussions of actinide chemistry to refer to any actinide. All but one of the actinides are f-block elements, corresponding to the filling of the 5f electron shell; lawrencium, a d-block element, is also generally considered an actinide. In comparison with the lanthanides, also mostly f-block elements, the actinides show much more variable valence. The actinide series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium.

Thorium(IV) nitrate chemical compound

Thorium(IV) nitrate is a chemical compound with the formula Th(NO3)4, which is hydroscopic and radioactive.

Sodium hydrogenoxalate chemical compound

Sodium hydrogenoxalate is the sodium salt of hydrogenoxalate. The only difference from oxalic acid is that one of the two hydrogen atoms has been replaced with a sodium atom. It is acutely toxic if it touches the skin or is swallowed.


  1. Enver Oktay, Ahmet Yayli (2001) Physical properties of thorium oxalate powders and their influence on the thermal decomposition Journal of Nuclear Materials Volume 288, Issue 1, January 2001, Pages 76–82
  2. Taishi KOBAYASHI, Takayuki SASAKI, Ikuji TAKAGI & Hirotake MORIYAMA (2009) Solubility of Thorium(IV) in the Presence of Oxalic and Malonic Acids Journal of Nuclear Science and Technology, Vol. 46, No. 11, p. 1085–1090