# Potassium tetraoxalate preparation [closed]

How is potassium tetraoxalate produced industrially? In fact How I can limit the reaction of $$\ce{H2C2O4}$$ and $$\ce{KOH}$$?

Or is there any other route for this purpose?

If you are to react potassium hydroxide with oxalic acid in 1:1 mole ratio, you will get potassium hydrogenoxalate ($$\ce{KHC2O4}$$). Its hydrate form exist at a specific temperature range. This salt contains the hydrogenoxalate anion and hence known as acid potassium oxalate. But if you add an excess of concentrated oxalic acid and maintaining a temperature of below $$\pu{50 °C}$$, the much less soluble potassium tetraoxalate ($$\ce{K+[C2HO4]^−.C2H2O4}$$) forms and precipitates out of solution since it is sparingly soluble in water. So your target compound depends on the concentration of the reagents and the temperature.