Description
Calcium sulfite, or calcium sulphite, is a chemical compound, the calcium salt of sulfurous acid with the formula CaSO3. In presence of moisture it commonly forms the hemihydrate CaSO3.0.5H₂O. Its uses as the pure compound are limited, such as a food additive, but it is produced in large quantities during flue gas desulfurization (FGD) with lime, which then exposed to air converts to common calcium sulfate (CaSO4, more exactly the gypsum form, CaSO4.2H₂O) by oxygen scavenging, this route of CaSO4 production via CaSO3 intermediate being the main source of drywall wallboard.
Synonyms
Calcium Sulfite;
IUPAC Name
calcium; sulfite
Molecular Weight
120.14
Molecular Formula
CaO3S
InChI
InChI=1S/Ca.H₂O3S/c;1-4(2)3/h;(H2,1,2,3)/q+2;/p-2
InChI Key
GBAOBIBJACZTNA-UHFFFAOYSA-L
Complexity
18.8
Covalently-Bonded Unit Count
2
EC Number
243-873-5
Exact Mass
119.9194
Formal Charge
0
H-Bond Acceptor
4
H-Bond Donor
0
Heavy Atom Count
5
LogP
-0.20270
Monoisotopic Mass
119.9194
Physical State
Off-white powder
Rotatable Bond Count
0
UNII
7078964UQP
