Which statement about water of crystallisation is correct?
Answer and explanation
Correct answer: It is water present in a fixed ratio in salt crystals
Water of crystallisation is the definite number of water molecules chemically associated with one formula unit of certain salt crystals. For example, washing soda is Na₂CO₃·10H₂O and blue copper sulphate is CuSO₄·5H₂O. Therefore, option B is correct. It is not an uncertain amount present in every salt, nor is it restricted to boiling water. The term also does not mean that the water itself is always acidic.
Frequently asked questions
What is the correct answer to this question?
It is water present in a fixed ratio in salt crystals
Why is this the correct answer?
Water of crystallisation is the definite number of water molecules chemically associated with one formula unit of certain salt crystals. For example, washing soda is Na₂CO₃·10H₂O and blue copper sulphate is CuSO₄·5H₂O. Therefore, option B is correct. It is not an uncertain amount present in every salt, nor is it restricted to boiling water. The term also does not mean that the water itself is always acidic.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
