What is a Arsenous acid (H₃AsO₃)?

Arsenous acid (H₃AsO₃) is an inorganic compound that contains arsenic (As) in the +3 oxidation state. It is typically found in the form of arsenites, such as sodium arsenite (Na₃AsO₃). Arsenous acid is highly reactive and can easily oxidize into arsenic acid (H₃AsO₄) upon exposure to oxygen. This compound is water-soluble and is primarily used in agriculture and chemical industries. In agriculture, arsenous acid salts are used as fertilizers, and it has antifungal and preservative properties, making it useful in crop protection and food preservation. However, arsenous acid is toxic, and excessive exposure can lead to arsenic poisoning, especially due to its chronic toxicity. Arsenic contamination in water or soil can pose significant health risks.

In chemical processes, arsenous acid is also used as a reducing agent for various reactions.

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