草酸钠（Na₂C₂O₄）为草酸的钠盐，是一种还原剂，也常作为双齿配体。

中和后以大量清水稀释排放

Sodium oxalate, or disodium oxalate, is the sodium salt of oxalic acid with the formula Na₂C₂O₄. It is usually a white, crystalline, odorless powder, that decomposes at 250–270 °C.

Disodium oxalate can act as a reducing agent, and it may be used as a primary standard for standardizing potassium permanganate (KMnO₄) solutions.