What is the colour of ferrous sulphate crystals? how does this colour change after heating?

Question

Answer

The colour of ferrous sulphate is green.On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. So their colour changes from light green to white.

Answer

Ferrous sulphate crystals are green in colour and after heating,they become white .On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed

Answer

Colour of Ferrous Sulphate Crystals

Ferrous sulphate crystals are typically pale green in color when in their hydrated form. This is due to the presence of water molecules in the crystal structure.

Colour Change after Heating

When ferrous sulphate crystals are heated, they undergo a chemical reaction known as dehydration. During this process, the water molecules are removed from the crystal structure, resulting in a change in color.

- Ferrous sulphate crystals that have been heated to a high temperature will turn from pale green to a yellow-brown color.
- This color change occurs because without water molecules in the crystal structure, the iron ions in the compound become oxidized.
- The presence of oxygen in the air causes the iron ions to form a new compound known as iron oxide, which has a yellow-brown color.

Explanation

The color change that occurs when ferrous sulphate crystals are heated is due to the chemical reactions that take place when the water molecules are removed from the crystal structure.

- When ferrous sulphate crystals are heated, the water molecules that are bonded to the iron ions in the crystal structure are removed.
- This causes the iron ions to become exposed to the air and to oxygen molecules.
- The oxygen molecules then react with the iron ions, causing them to become oxidized.
- The oxidized iron ions then form a new compound known as iron oxide, which has a yellow-brown color.

In conclusion, ferrous sulphate crystals are pale green in color when hydrated, but turn yellow-brown when heated due to the removal of water molecules and subsequent oxidation of the iron ions.

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