Question

What color is ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$?

Answer 1

Hydrated Copper sulfate:

• ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$ is hydrated Copper sulfate
• Color of hydrated Copper sulfate is blue.
• Blue vitriol is a common name for hydrated Copper sulfate.
• It involves Copper sulfate along with $5$ molecules of water.

Heating blue vitriol:

• When blue vitriol or hydrated Copper sulfate solution is heated, it loses its water of crystallization and becomes anhydrous.
• The anhydrous form of Copper sulfate solution is ${\mathrm{CuSO}}_4$ and it is greyish-white in color.