What is a Oxalic Acid Dihydrate?

Oxalic acid dihydrate (chemical formula: C₂H₂O₄·2H₂O) is a hydrated form of oxalic acid, containing two molecules of water in its crystalline structure. It appears as colorless crystals or white crystalline powder and is highly soluble in water. This compound shares many properties with oxalic acid, but the presence of water in the crystals leads to slight changes in its chemical characteristics. Oxalic acid dihydrate, like oxalic acid, is acidic and is commonly used in applications such as rust removal, dyeing, and bleaching. It is particularly used in cleaning and rust removal of metals. Oxalic acid compounds are toxic, so care should be taken when handling them.

The compound is also utilized in analytical chemistry as a reagent in various chemical reactions requiring oxalic acid. Its production involves the hydration process of oxalic acid.

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