Oxalic acid exhibits several uncommon physical properties compared to typical organic acids. Firstly, it possesses a relatively high melting point of about 189 degree , which is notably higher than many other carboxylic acids of similar molecular weight. This property is due to its ability to form strong intermolecular hydrogen bonds between its molecules, resulting in a solid state at room temperature. Secondly, it has limited solubility in cold water, with approximately 1.6 grams dissolving in 100 mL of water at 20 degree . This solubility increases significantly with temperature, but the initial low solubility is a distinguishing feature. it exhibits a strong tendency to form stable complexes with metals such as calcium and iron, leading to its historical use in cleaning and bleaching operations. These unusual physical characteristics make oxalic acid a distinctive compound with applications ranging from industrial processes to biological and chemical research.

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