binoxalate

Binoxalate refers to an acidic salt containing the binoxalate anion, C2O4H-. This anion is formed by the partial neutralization of oxalic acid (H2C2O4) with a base, such as sodium hydroxide (NaOH). The most common examples are potassium binoxalate (KC2O4H) and sodium binoxalate (NaC2O4H).

Oxalic acid is a dicarboxylic acid, meaning it has two carboxyl groups. When it reacts with one equivalent of a base, it forms a binoxalate salt where one of the carboxyl groups has been deprotonated, leaving a hydrogen atom attached to the other. This results in an anion with a single negative charge. Binoxalate salts are typically soluble in water.

Binoxalate compounds find various applications. Potassium binoxalate, for instance, has been used as a mordant in dyeing and as a cleaning agent for removing rust and ink stains due to its ability to form soluble complexes with metal ions. It is also sometimes used in analytical chemistry.

It is important to note that oxalic acid and its salts, including binoxalate compounds, are toxic. Ingestion can lead to severe health consequences, including kidney damage, due to the formation of insoluble calcium oxalate crystals in the renal tubules. Therefore, handling and storage should be done with appropriate precautions. The presence of the oxalate anion indicates potential for these toxic effects.