Oxalic Acid

Oxalic acid is an organic compound which normally appears as a colorless crystalline solid and forms a colorless solution in water. In terms of acid strength, it is much stronger than acetic acid.

Oxalic acid is a reducing agent and its conjugate base is known as oxalate which is a chelating agent for metal cations. It is used as a mordant in dyeing processes and in bleaches, especially for pulpwood. It is also used in baking powder. Vaporized oxalic acid is used by some beekeepers as a miticide against the parasitic varroa mite.

Oxalic acid can be rubbed onto completed marble sculptures to seal the surface and introduce a shine. It is also used to clean iron and manganese deposits from quartz crystals. Oxalic acid is used as bleach for wood, removing black stains caused by water penetration.

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