Barium oxalate

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Barium oxalate
Barium oxalate.png
Identifiers
CAS number 516-02-9 YesY
PubChem 68201
ChemSpider 61508 YesY
Jmol-3D images Image 1
Properties
Molecular formula BaC2O4
Molar mass 225.346 g/mol
Density 2.658 g/cm3
Melting point 400 °C (752 °F; 673 K) (decomposes)
Solubility in water 0.9290 mg/L
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

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

Though largely stable, it can be reactive with strong acids. A mild skin irritant, the substance is considered toxic when ingested, causing nausea, vomiting, renal failure and injury to the gastrointestinal tract. Its molecular structure is written as BaC2O4. The raw materials that are required to prepare Barium oxalate are oxalic acid, Barium hydroxide octahydrate, and Barium hydroxide.

It can also be prepared alternatively by using an oxalic acid solution and a Barium chloride solution, with the reaction as follows:

BaCl2 + H2C2O4 → BaC2O4↓ + 2 HCl

It is different from most pyrotechnic colorants in that it is a reducing agent, and not an oxidizing agent. It is extremely insoluble in water and converts to the oxide form when heated.

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