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प्रश्न
Define water of crystallization. Give two examples with formulae.
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उत्तर
The fixed amount of water which is in loose chemical combination with a salt in its crystal is called water of crystallization.
Examples:
| Common name | Chemical name | Formulae |
| Blue vitroil | Copper sulphate pentahydrate |
CuSO4 5H2O |
| Green vitriol | Iron (2) sulphate heptahydrate | FeSO4 7H2O |
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संबंधित प्रश्न
Water turns the colour of anhydrous copper sulphate .................
State the methods by which hydrated salts can be made anhydrous.
What are hydrous substances? Explain with examples.
The process of separation or deposition of crystals from a hot saturated solution on gentle cooling of the solution is called ‘crystallization’. With reference to the statement explain what is meant by ‘water of crystallization. State which physical properties of a crystal are correlated with the water of crystallization.
Differentiate between an efflorescent, deliquescent & ‘ hygroscopic substance with suitable examples.
Differentiate the function of concentrated sulphuric acid as a drying agent & as a dehydrating agent. Is fused calcium chloride a dehydrating or a desiccating agent. Give reasons.
Complete the statement by filling the blank with the correct word from the option.
Hygroscopic substance absorb moisture from the atmosphere & _______their original state.
Match the substances in List I with the appropriate answer in List II.
| List I | List II |
| 1. Green vitriol | A: Permanent hardness in water |
| 2. Paint | B: Hygroscopic |
| 3. Magnesium chloride | C: Temporary hardness in water |
| 4. Magnesium bicarbonate | D: Heptahydrate |
| 5. Calcium oxide | E: Colloidal |
Explain the following observation:
Why is fused calcium chloride or cone, sulphuric acid used in a desiccator?
A hot saturated solution of copper sulphate forms crystals as it cools. Why?
