Sulphate

salt or ester of sulfuric acid
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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 sulphuric acid loses two hydrogens. If it only loses one, a hydrogen sulphate ion is made.

Structure of the sulphate ion