Na2C2O4

Sodium oxalate, with the chemical formula Na2C2O4, is the sodium salt of oxalic acid. It typically appears as a white, crystalline solid. This compound is soluble in water, forming a neutral solution.

Sodium oxalate is a common laboratory reagent. It is often used in volumetric analysis, particularly in the standardization of potassium permanganate solutions. The reaction between sodium oxalate and potassium permanganate in acidic solution is a well-known redox titration. It is also employed in the determination of calcium ions, as it forms an insoluble precipitate of calcium oxalate.

The production of sodium oxalate can be achieved through the reaction of oxalic acid with sodium hydroxide or sodium carbonate. Historically, it was produced by heating sodium formate.

In industrial applications, sodium oxalate finds use in various processes. It can be employed as a reducing agent, a mordant in dyeing, and in the purification of rare-earth metals. It has also been used in the manufacture of other oxalate salts.

It is important to note that sodium oxalate is toxic if ingested. It can cause irritation to the skin and eyes. Proper handling procedures should be followed when working with this chemical. Its toxicity is related to the oxalate ion, which can bind with calcium in the body, potentially leading to hypocalcemia and kidney damage.