Sulfites

Definition

Sulfites are compounds that contain the sulfite ion $SO_3^{2-}$. They commonly serve as preservatives in food and beverages.

5 Must Know Facts For Your Next Test

1. Sulfites are used to prevent oxidation and spoilage in various food products.
2. The sulfite ion consists of one sulfur atom bonded to three oxygen atoms, with a -2 charge.
3. Sulfites can occur naturally during fermentation processes but are also added artificially in food processing.
4. Exposure to air can oxidize sulfites into sulfates ($SO_4^{2-}$), which are less reactive.
5. Individuals with asthma or sulfite sensitivity may experience adverse reactions to these compounds.

Review Questions

• What is the chemical formula for the sulfite ion?
• In what types of products are sulfites commonly used as preservatives?
• What potential health risks are associated with exposure to sulfites?

Related terms

Sulfur Dioxide: A gas $SO_2$ often used as a preservative and disinfectant in food processing.

Metabisulfite: $Na_2S_2O_5$ or $K_2S_2O_5$, used in winemaking and brewing as an antioxidant.

Sulfate: $SO_4^{2-}$, a common oxidation product of sulfites that is less reactive.