What Is the Formula for Calcium Sulfite?

The molecular formula for the chemical compound calcium sulfite is written as CaSO3. The formula illustrates that the compound contains one atom of calcium, represented by Ca; one atom of sulfur, represented by S; and three atoms of oxygen, represented by the symbol O.

Calcium sulfite is the calcium salt derived from sulfuric acid. It is used as a food preservative in fruit-based products. Calcium sulfite has a molar mass of about 120.17 grams per mole, and it has a boiling point of 1,112 degrees Fahrenheit. The compound is composed of a calcium ion and a sulfite ion, which when combined together create a molecule carrying a neutral charge.