If Copper sulphate crystals are added to water it is called 'hydrated copper sulphate solution'. If copper sulphate crystals are added to water then the particles of copper sulphate crystals loses attraction between them and starts moving continuously and gets mixed up with water . Water color changes to blue .

Introduction:
Copper sulphate is a blue crystalline compound with the chemical formula CuSO4. It is used for various purposes including as an agricultural fungicide, as a pigment, and in the manufacture of other copper compounds.

What happens when copper sulphate is put in water:
When copper sulphate crystals are placed in water, they dissolve and form a blue solution. This occurs because the water molecules surround the copper and sulphate ions in the solid, and break them apart. The copper ions become hydrated in the solution, which means that they are surrounded by water molecules.

Factors affecting the rate of dissolution:
The rate at which the copper sulphate dissolves in water can be affected by several factors, including:

- Temperature: The rate of dissolution increases as the temperature of the water increases.
- Surface area: The rate of dissolution increases as the surface area of the copper sulphate crystals increases.
- Agitation: Stirring the solution can increase the rate of dissolution.

Uses of copper sulphate solution:
Copper sulphate solution has several uses, including:

- Agricultural fungicide: Copper sulphate solution can be used to prevent the growth of fungi on crops.
- Electroplating: Copper sulphate solution is used in the process of electroplating to coat objects with a thin layer of copper.
- Laboratory experiments: Copper sulphate solution is used in various laboratory experiments, including as a reagent in chemical reactions and for crystal growing.

Precautions:
Copper sulphate solution can be harmful if ingested or if it comes into contact with the skin or eyes. It is important to handle it with care and to wear protective gloves and eyewear when working with it. It is also important to dispose of the solution properly, as it can be harmful to the environment if it is not disposed of correctly.