In chemistry, disulfate or pyrosulfate is the
anion
An ion () is an atom or molecule with a net electrical charge.
The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by conve ...
with the molecular formula . Disulfate is the IUPAC name.
It has a
dichromate-like structure and can be visualised as two corner-sharing SO
4 tetrahedra
In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all the ...
, with a bridging oxygen atom.
[ ]
In this anion, sulfur has an
oxidation state
In chemistry, the oxidation state, or oxidation number, is the hypothetical charge of an atom if all of its bonds to different atoms were fully ionic. It describes the degree of oxidation (loss of electrons) of an atom in a chemical compound. ...
of +6. Disulfate is the
conjugate base
A conjugate acid, within the Brønsted–Lowry acid–base theory, is a chemical compound formed when an acid donates a proton () to a base—in other words, it is a base with a hydrogen ion added to it, as in the reverse reaction it loses a ...
of the hydrogen disulfate (hydrogen pyrosulfate) ion , which in turn is the conjugate base of
disulfuric acid
Disulfuric acid (alternative spelling disulphuric acid) or pyrosulfuric acid (alternative spelling pyrosulphuric acid), also named oleum, is a sulfur oxoacid. It is a major constituent of fuming sulfuric acid, oleum, and this is how most chemists ...
(pyrosulfuric acid).
See also
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Potassium pyrosulfate
Potassium pyrosulfate, or potassium disulfate, is an inorganic compound with the chemical formula K2S2O7.
Production
Potassium pyrosulfate is obtained by the thermal decomposition of other salts, most directly from potassium bisulfate:
: 2 KHSO4 ...
*
Sodium pyrosulfate
Sodium pyrosulfate is an inorganic compound with the chemical formula of Na2S2O7. It is a colorless salt.
Preparation
Sodium pyrosulfate is obtained by the dehydration of sodium bisulfate:
: 2 NaHSO4 → Na2S2O7 + H2O
Temperatures above 460&nb ...
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Pyrophosphate
In chemistry, pyrophosphates are phosphorus oxyanions that contain two phosphorus atoms in a P–O–P linkage. A number of pyrophosphate salts exist, such as disodium pyrophosphate (Na2H2P2O7) and tetrasodium pyrophosphate (Na4P2O7), among o ...
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Pyrocarbonate
In organic chemistry, a dicarbonate, also known as a pyrocarbonate, is a compound containing the divalent ��O−(C=O)−O−(C=O)−O−or −− functional group, which consists of two carbonate groups sharing an oxygen atom. These compounds ...
References
{{reflist
Sulfur oxyanions