Disulfurous acid
Encyclopedia
Disulfurous acid or pyrosulfurous acid is an oxoacid
of sulfur
with the formula
H2S2O5. The salt
s of disulfurous acid are called disulfites
or metabisulfites. Disulfurous acid is, like sulfurous acid
(H2SO3), a phantom acid, which does not exist in the free state.
In contrast to disulfate (S2O7−), disulfite has two directly connected sulfur atoms.
Oxoacid
An oxoacid is an acid that contains oxygen. To be more specific, it is an acid that:#contains oxygen#contains at least one other element#has at least one hydrogen atom bound to oxygen#forms an ion by the loss of one or more protons....
of sulfur
Sulfur
Sulfur or sulphur is the chemical element with atomic number 16. In the periodic table it is represented by the symbol S. It is an abundant, multivalent non-metal. Under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S8. Elemental sulfur is a bright yellow...
with the formula
Chemical formula
A chemical formula or molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound....
H2S2O5. The salt
Salt
In chemistry, salts are ionic compounds that result from the neutralization reaction of an acid and a base. They are composed of cations and anions so that the product is electrically neutral...
s of disulfurous acid are called disulfites
Metabisulfite
A disulfite, commonly known as metabisulfite, is a chemical compound containing the disulfite ion [S2O52−].-Production of the disulfite ion:The disulfite ion is a dimer of the bisulfite ion...
or metabisulfites. Disulfurous acid is, like sulfurous acid
Sulfurous acid
Sulfurous acid is the chemical compound with the formula H2SO3. There is no evidence that sulfurous acid exists in solution, but the molecule has been detected in the gas phase...
(H2SO3), a phantom acid, which does not exist in the free state.
In contrast to disulfate (S2O7−), disulfite has two directly connected sulfur atoms.