In chemistry, a sulphate (sulfate US English) is a salt of sulphuric acid. The sulphate ion is a group of atoms with the formula SO4 and two negative charges. It consists of a central sulphur atom surrounded by four (equivalent) oxygen atoms. It occurs when sulfuric acid loses two hydrons. If it is only loses one, a hydrogen sulfate ion is made.
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Structure of the sulphate ion
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