oxalic acid

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Traits: colorless, transparent crystal or powder. Its crystal structure has two forms, namely, a-(diamond) and b-type (monoclinic crystal form). Odorless. Melting point: a-type: 189.5 'c, b-type: 182 'c Boiling point: three-dimensional molecular model of boiling point 150 'c (sublimation). Relative density: 1.653 (dihydrate), 1.9 (anhydrous material). type a: 1.900, b-type: 1.895 Refractive index: 1.540 Stability: 189.5 'c decomposition Dissolved the situation: soluble in ethanol. Soluble in water. Micro-soluble in ether. Do not dissolve in benzene and chloroform. Water-soluble 90 g / L (20 ' c). Other nature: the beginning of oxalic acid at 100 'csublimation, 125 'crapid sublimation, 157 'c, when a large number of distillation, and begins to decompose. Reaction with alkali, esterification can occur, acid halide, amide reaction. Reduction reaction can also occur, heat decarboxylation reaction occurred. Anhydrous oxalic acid are hygroscopic. Oxalic acid can be formed with a number of metal complexes soluble in water. Toxicity Toxic oxalic acid. On the skin and mucous membrane irritation and corrosion are easily by the skin and mucous membrane absorption caused by poisoning. Maximum allowable air concentration of 1m g/m3. Oxalic acid mainly used as a reducing agent and bleaching agent. My email：andylh@188.com MSN:yaolei916@yahoo.cn

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TIANJIN YIXINHONGHUI CHEMICALS

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