What is the Colour of Anhydrous Copper Sulphate

Q. What is the colour of anhydrous copper sulphate?

To begin, it is imperative that we have a firm grasp on the meaning of the term “anhydrous.” An anhydrous compound is one that has lost all of its water during the process of becoming a crystalline solid. In order to produce an anhydrous chemical, a crystalline material must first remove its water molecule using one of a number of processes, including heating, freeze-drying, vacuuming, desiccators, etc.

Now, the chemical formula for crystalline copper sulphate looks like this: CuSO4.5H2O.

Or, when a copper derivative such as cupric oxide (CuO), cupric hydroxide (Cu(OH)2), or cupric carbonate (CuCO3) is added to dilute hydro sulfuric acid (H2SO4), the copper is hydrated to form hydrated copper (II) sulphate or blue vitriol. This occurs because the cupric oxide, cupric hydroxide, and cupric carbonate react with the dilute hydro sulfuric acid to form (CuSO4.5H2O).

This newly created blue vitriol is a pentahydrate with a molar mass of 249.685 g/mol and coloration of blue. It may be dissolved in water and does not catch fire easily.

Now, when this hydrated copper (II) sulphate (CuSO4.5H2O) or blue vitriol is heated at high temperatures, it loses its water of crystallisation (5H2O) and produces amorphous copper sulphate. Blue vitriol is a colourless, odourless, and tasteless liquid (CuSO4).

When heated, the blue vitriol transforms into a white colour.

Because of this, amorphous copper sulphate (CuSO4) appears to be white in hue.

Amorphous copper sulphate, the chemical formula CuSO4, has a powdery consistency and a molar mass that comes in at 159.60 grams per mole. At a temperature of 383 Kelvin, it begins to disintegrate.