KC2O4H

KC2O4H is the chemical formula for potassium hydrogen oxalate. It is an acidic salt formed from the reaction of potassium hydroxide with oxalic acid. This compound typically appears as a white crystalline solid. It is soluble in water, and its aqueous solutions are acidic due to the presence of the hydrogen oxalate ion.

Potassium hydrogen oxalate has various applications. It is used as a cleaning agent, particularly for removing rust and ink stains, owing to the chelating properties of the oxalate ion and the acidity. It can also be found in some analytical chemistry procedures as a titrant. In historical contexts, it has been used in photography.

The preparation of KC2O4H can be achieved by carefully controlling the stoichiometry of the reaction between potassium hydroxide (KOH) and oxalic acid (H2C2O4). Alternatively, it can be formed by the partial neutralization of oxalic acid with a potassium base, or by the reaction of potassium oxalate (K2C2O4) with oxalic acid.

Like other oxalates, potassium hydrogen oxalate should be handled with care. Ingestion can lead to gastrointestinal irritation and, in larger quantities, more severe health effects due to the oxalate content.