Barium oxalate

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Barium oxalate
Barium oxalate.png
3D model (JSmol)
ECHA InfoCard 100.007.471
Molar mass 225.346 g/mol
Density 2.658 g/cm3
Melting point 400 °C (752 °F; 673 K) (decomposes)
0.9290 mg/L
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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.


Though largely stable, barium oxalate 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.

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.


The raw materials that are required to prepare barium oxalate are oxalic acid and barium hydroxide (or its octahydrate).

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

BaCl2 + H2C2O4 → BaC2O4↓ + 2 HCl