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Hydrated copper sulphate

Hydrated copper sulphate

A500/0382

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Credit

ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY

Caption

Hydrated copper sulphate. Image 3 of 3. Copper sulphate crystals (CuSO4) have a blue colour due to the presence of water of crystallisation within the molecular structure of the crystals. Without this, they are white. Hydrated copper sulphate has the formula CuSO4.5H2O. Heating removes the five water molecules (H2O), leading to the colour being lost. The process is reversible, and addition of water to the anhydrous crystals restores their blue colour. For a sequence showing the addition of water to anhydrous crystals, see images A500/380-382.

Release details

Model release not required. Property release not required.

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