It will darken the copper (II) sulfate solution.
It is soluble in water so a green solution is formed.
Blue is the solution's color When blue CuSO4.5H2O (copper(II) sulfate pentahydrate) is dissolved, the solution turns blue. When white CuSO4 (anhydrous copper(II) sulfate) is dissolved, the solution turns also blue.
The aqueous solution of ferrous sulfate, FeSO4, is light green on heating. It changes to yellow then brown due to formation of ferric sulfate.
Its colour is nearly red and orange.
green colour
NiS nickel sulfide
It will darken the copper (II) sulfate solution.
The sulfate ion itself does not contribute color to a solution, but the accompanying cation may contribute color.
It is soluble in water so a green solution is formed.
Yellowish
Blue is the solution's color When blue CuSO4.5H2O (copper(II) sulfate pentahydrate) is dissolved, the solution turns blue. When white CuSO4 (anhydrous copper(II) sulfate) is dissolved, the solution turns also blue.
The aqueous solution of ferrous sulfate, FeSO4, is light green on heating. It changes to yellow then brown due to formation of ferric sulfate.
Its colour is nearly red and orange.
Nickel sulfate is an ionic compound though it has covalent bonds within the sulfate ion itself.
nickel (ll) sulfate heptahydrate
Stannous sulphate: SnSO4 Nickel sulphate: NiSO4.6H2O