Potassium hydrogenoxalate
Potassium hydrogenoxalate, also known as potassium bioxalate, is a salt with formula KHC2O4 or K·HO2C-CO2. It is one of the most common salts of the hydrogenoxalate anion, and can be obtained by reacting potassium hydroxide with oxalic acid in 1:1 mole ratio.