it is (SO4)-2
Ferrous sulphate, or iron (II) sulphate has the formula FeSO4.
The formula for ferrous sulphate is FeSO4.
Ferric sulphate, or iron (III) sulphate has the formula Fe2(SO4)3.
The Chemical Formula for Nickel Sulphate is NiSO4.
The molecular formula for Ammonium Sulphate is (NH4)2SO4.
FeSO4 ( Ferrous Sulphate ; Iron (II) Sulphate) Do not confuse with Fe2(SO4)3 ( Ferric Sulphate) ; Iron (III) sulphate Iron (Fe) is in a different oxidation state.
Anhydrous sodium sulphate is Na2SO4
The formula of the sulphate ion is SO42-
Formula: MgSO4
Formula: FeSO4
the formula is CuSO4
Formula: Na2SO4