Chemical properties colorless transparent single crystal is inclined crystallization. Usually in two water content exists. Melting point 101 ~ 102 ℃. The relative density (19) 1.65 ℃. The refractive index of 1.440. Soluble in water, slightly soluble in ethanol and aether. 157 ℃ distillation. Two water content easy weathering water loss and no water into oxalic acid. There is no water melting point 189.5 ℃ (decomposition thing).
Use in acidic tin in complexing agent, it and the four chlorination tin complexation of salt dissolved in the tin plating solution. General addition amount for 24 to 25 g/L. Can also be used in pieces of copper polishing. Aluminum oxalate anodic oxidation and the hard anodic oxidation solution, and sulfate plating iron and brush plating collaterals, etc in plating solution.