Blue-Green.
Ferrous Sulphate, also known as Iron (II) sulphate or green vitrol is green.
When you add copper sulphate solution to iron wool. The iron wool turns copper in color and the copper sulphate solution turns pale blue as the iron displaces the copper from the copper sulphate solution forming iron sulfate.
iron and sulphate 2
copper sulphate+iron+water
Iron is needed to produce iron sulphate.
When an iron nail is placed in a copper sulphate solution, iron displaces copper from copper sulphate solution forming iron sulphate, which is green in colour.Therefore, the blue colour of copper sulphate solution fades and green colour appears.
There are two compounds , that are sulphates of iron. It depends on the oxidation state of the iron cation. Oxid'n state '2' ; Ferrous sulphate ;Iron(II) sulphate ; (FeSO4) (Pale green colour) Oxid'n state '3' ; Ferric sulphate ;Iron(III) sulphate ; (Fe2(SO4)3) (Brown colour).
iron sulphate will be created
Iron(Fe) + Copper Sulphate(CuSO4) → Iron Sulphate(Fe2SO4) + Copper(Cu)[Displacement Reaction]
The chemical formula for Iron Sulphate is FeSO4 So, there is Iron, Sulphur and Oxygen present.
The heptahydrate FeSO4.7H2O is blue green.
When iron II sulphate reacts with ammonia, it forms ferrous ammonia sulphate [Fe(NH3)2(SO4)2]. This compound is a coordination complex in which the iron atom is surrounded by ammonia molecules and sulfate ions.