Lanthanum oxalate is an inorganic compound, a salt of lanthanum metal and oxalic acid with the chemical formula .
Reaction of soluble lanthanum nitrate with an excess of oxalic acid:
Also, a reaction of lanthanum chloride with oxalic acid:
Lanthanum(III) oxalate forms colorless crystals that are poorly soluble in water.
The compound forms various crystallohydrates â¢n, where n = 1, 2, 3, 7, and 10.
The crystallohydrates decompose when heated.