how can you show that copper sulphate contains water molecules
Answers
Answer:
copper sulphate is pentahydrated as it is also called blue vitrol
Answer:
Crystals of salts appear dry. But many salts contain some water molecule. This water molecules contain by crystals of slats is known as water of crystallization. Salts that contain water molecules are known as hydrated salts. For example: copper sulphate, gyspsum, sodium carbonate, etc.
Example: (1)
Sodium Carbonate (Washing soda):
Sodium carbonate which is also known as washing soda, contains 10 (ten) water molecules, because of this sodium carbonate is called sodium carbonate decahydrate. Sodium carbonate which does not contains any water molecule is called anhydrous sodium carbonate. Anhydrous sodium carbonate is also known as soda ash.
The chemical formula of sodium carbonate is Na2CO3 . 10 H2O
Sometimes, crystals of sodium carbonate contain seven water molecules. In such case chemical formula of sodium carbonate is written as Na2CO3 . 7 H2O and it is called sodium carbonate heptahydrate.
Example: (2)
Copper Sulphate
Crystals of copper sulphate appears blue because it contains 5(five) water molecules. This is the cause that chemical formula of copper sulphate is CuSO4 . 5 H2O.
When crystals of copper sulphate is heated, it loses its water molecule and its colour and becomes grey white.